C语言复习题(1)

一、            选择题:下列各题A)、B)、C)、D)四个选项中只有一个是正确的,请将正确的选项涂写在答案纸上。答在试卷上不得分。

(1C语言规定:在一个源程序中,main函数的位置        

A)必须在最后                      B)必须在系统调用的库函数的后面。

C)必须在最开始。。                D)可以任意

(2) C语言中的标识符只能由字母、数字和下划线三种字符组成,且第一个字符        

A)必须为字母或下划线。          B)必须为下划线。

C)必须为字母               D)可以是字母、数字和下划线中的任一种字符。

(3)下面四个选项中,均是正确的八进制数或十六进制数的选项是         

A-10  0x8f  -011               B)  010  -0x11  0xf1

C)  0abc  -017  0xc             D)  0a12  -0x123  -0xa

(4) C语言中int型数据在内存中占两个字节,则unsegned int取值范围是          

A0 ~ 65535                             B0 ~ 32767      

C-32767 ~ 32768                  D-32768 ~ 327687  

 

(5) 若有定义:int  a = 7;  floa  x = 2.5 ,  y = 4.7 ;

     则表达式 x + a % 3 * (int) (x + y) % 2/4  的值是         

A)   2.750000       B)   0.00000  C) 3.500000          D) 2.500000

 

(6)已知ch是字符型变量,下面不正确的赋值语句是          

Ach = 5 + 9       ;      B) ch= ' a + b '; C) ch = ' \ 0 ';            D) ch= '7' + '6'      ;     

(7) x , yzint型变量,且x = 3, y = 4 , z = 5 则下面表达式中值为0

               

A!((x < y )&&!z || 1)        B) ' x ' && ' y '            C) x || y+z && y - z             D)x <= y

 

(8)设有程序段

int  k = 10 ;

while ( k = 0 )  k = k - 1 ;

    以下描述正确的是          

A) 循环体语句一次也不执行。       B) 循环是无限循环。

C) while 循环语句执行十次。          D) 循环体语句执行一次。

 (9) 以下C程序正确的运行结果是          

     main ( )

{long  y = 23456;

 printf ( " y = % 3x \ n ", y);

 printf ( " y = % 8x \ n ", y);

 printf ( " y = % # 8x \ n ", y);

}

A) y = 5ba0           By =   5ba0            C ) y = 5ba0          Dy = 5ba0

y =    5ba0      y =    5ba0              y = bba0               y =    5ba0

y =  0x5ba0     y =  0x5ba0              y = 0x5ba0                    y = ####5ba0

(10) a = 1 , b = 3 , c =5 d=4时,则执行完下面一段程序后,x的值是           

     if  ( a < b )

 if  ( c < d )  x = 1;

  else

   if  ( a < c )

    if  ( b < d )  x = 2 ;

    else  x = 3 ;

   else  x = 6 ;

  else  x = 7 ;

A1          B) 3        C)  2            D) 6

(11) 下面程序的运行结果是        

# include  " stdio.h "

main ( )

{ int  a = 1 ,  b = 10

  do

   { b - = a ;  a + + ; }

  while ( b - - < 0 ) ;

   printf ( " a = % d ,  b = % d \ n ), a , b );

Aa = 3 ,  b = 11                                   Ba = 4 ,  b = 9

Ca = 1 ,  b = -1                                   Da = 2 ,  b = 8

(12)以下for 循环的执行次数是           

     for ( x = 0, y = 0; (y = 123 ) && ( x<4 ); x + + );

A) 无限次。      B4次。      C0      D3次。

(13) 以下是死循环的程序段的是        

A) for  ( i = 1 ;  ;  )                           B) i = 32767

  { if ( + + i % 2 = = 0 )  continue ;         do { if ( i < 0 )  break ; }  while ( + + i )

      if ( + + i % 3 = = 0 )  break ;  }

C) for ( i = 1 ;  ; )                                          D) i = 1

  if ( + + i < 10) continue ;                        while ( i - - ) ;

(14) 若有说明:int  a[10] ; 则对a 数组元素的正确引用是        

A) a [10 ]                     Ba[10 - 10]               Ca ( 5 )                    Da[3.5]

 

(15) 根据定义和数据的输入方式,输入语句的正确形式为          

      已有定义:float  f1,f2;  数据输入方式:4.25

                                          3.5

Ascanf ("%f%f ",&f1,&f2);                   B) scanf ("%f ,%f ",&f1,&f2);

C) scanf ("%3.2f %2.1f ",&f1,&f2);          D) scanf ("%2.1f %3.2f ",&f1,&f2);

(16) 已知ch是字符型变量,下面正确的赋值语句是           

Ach = '123' ;      B)   ch=' \08 ';  C) ch =' \xff ';   D) ch =" \ ";

 

(17)以下if语句语法正确的是          

A) if (x>0)                                         B) if (x>0)  printf ( "%f ",-x )

{ x=x+y; printf ("%f ", x);}              else  printf ("%f",-x);

 else  printf ("%f ", -x);

C) if (x>0)                                       D) if(x>0)

  {x=x+y ; printf ("%f ", x);};                      {x=x+y ; peintf ("%f", x)}

  else  printf ("%f", -x)      ;                       else  printf ("%f", -x);

(18) W=1, X=2, Y=3, Z=4 则条件式:

     W < X W : Y < Z ?  Y : Z 的值是          

A1    B3   C4   D2

(19) 以下程序段        

x = -1;

do  {x = x*x ; }

while (! x);

A) 是死循环                             B)循环执行一次

C)循环执行二次                     D)有语法错误

(20) 逻辑运算符两侧运算对象的数据类型            

A)只能是01                   B) 可以是任何类型的数据       

C) 只能是整型或字符型数据    D)只能是0或非0正数

(21)下面程序中有错误的行是           。(前面数字表示行号)

1、               main ( )                                5scanf ( "% d ",& a ) ;

2、               {                                                 6for ( i =1 ; i < 3; i + + )  a[0] = a[0] + a[i],

3、               int  a[3 ] = {1};                   7printf ( " a[0] = % d \ n ", a[0] );

4、               int   i ;                               8}

 A)  3                 B 6                  C 5                  D 7

(22)下面的程序段             

     for ( t = 1 ; t < = 100, t + + )

      {scanf ("%d", &x);

        if ( x <0 )  continue;

        printf ("%3d", t );

       }

     A) x < 0 时整个循环结束          B)当 x >= 0时什么也不输出

     C) printf 函数永远也不执行           D)最多允许输出100个非负整数

(23)以下对一维整型数组a的正确说明是                 

     Aint  a (10)                                B) int  n = 10; a[n ];

     C)  int  n;                                     D) #  define  SIZE  10

        scanf ("%d", &n);                         int  a [SIZE];

        int  a [n];

(24) 下面程序的运行结果是        

a=1;  b=2;  c=2;

while (a<b<c) {t = a ; a = b ; b = t ; c - - ;}

printf ("%d , %d, %d", a, b, c);

A) 1, 2, 0      B) 2, 1, 0      C) 1, 2, 1      D) 2, 1, 1

(25) 若有说明:int  a[3][4]; 则对数组元素的非法引用是                

Aa[0][2*1]      B) a[0][4]      C) a[4-2][0]      D) a[1][3]

(26) 对以下说明的正确理解是               

      int  a[10] = {6, 7, 8, 9, 10}

     A) 5个初值依此赋给a [1] a[5]       B)将5个初值依此赋给a [0] a [4]

     C)将5个初值依此赋给a [6] a[10]    D) 因长度与初值个数不同,故语句错误

(27) 若二维数组am列,则在a[ i ][ j ] 前的元素个数为           

     A)  i * m + j             Bj * m + i     C)  i*m + j -1   Di * m + j + 1

(28) 以下程序段运行的结果是                 

      char  c[5] ={ ' a ', ' b ', ' \ 0 ', ' c ', ' \ 0 ' };

      printf  ( " % s ", c );

     A' a ' ' b '               B) ab c                 C) abc                  D) ab

(29) 以下正确的函数定义形式是                

     A) double  fun ( int x ,  int y )      B) double  fun ( int x ;  int y )

     C) double  fun ( int x ,  int y ) ;     D) double  fun ( int x ,  int y );

(30) 以下不正确的说法是               

     A) 实参可以是常量、变量或表达式。  B)形参应与其对应的实参类型一致。

     C)实参可以为任意类型。                   D)形参可以是常量、变量或表达式。

(31) 有两个字符数组 a,  b,则以下正确的输入格式是               

     A) scanf ("% s % s", &a, &b )                 B) gets (a, b)

C) scanf ("% s % s", a, b )                D) gets ("a"); gets ("b")

 

(32) 以下程序正确的运行结果是               

      main ( )

     {int  a = 2 ,  i ;

      for (  i = 0 ; i < 3 ; i + + )  printf ( " % 4 d " , f(a) ) ;

     }

      f( int a)

     { int  b = 0 ;  static  int  c = 3 ;

       b + + ;  c + + ;

       return ( a + b + c ) ; }

     A) 7  7  7                B) 7  10  13                     C) 7  8  9                  D) 7  9  11

 

(33) # define 能做简单的替代,用宏替代计算多项式4*x*x + 3*x + 2 之值的函数f, 正确的宏定义是             

    A)  # define  f(x)  4*x*x + 3*x + 2        B)  # define  f  4*x*x + 3*x + 2

C)  # define  f(a)  (4*a*a + 3*a + 2)             D)  # define  (4*a*a + 3*a + 2)  f(a)

(34) 当运行以下程序时,从键盘输入:ab <CR>

                                                           c <CR>

                                                           def <CR>

     (<CR>表示回车)则下面程序的运行结果是                

     # include  "stdio.h"

     # define   N 6

     main ( )

     {char  c (N);

        int  i= 0;

        for (  ;i < N; c[i] = getchar ( ),i++);

        for (i = 0; i < N; i++)  putchar(c[i]);

      }

A) abcdef              B)  a            C)  b            D) ab

                                       b                 c                   c

                                   c                   d                   d

                                   d

                                   e

                                   f

 (35) 请读程序:

         #  define  AD(x)   x + x

            main ( )

         {int  m = 1,  n = 2 ,  k = 3 ;

          int  sum = AD( m + n )*k ;

          printf ( " sum = % d ", sum ); }

上面程序的运行结果是                

   A) sum = 9                           B)  sum = 10                     C)   sum = 12              D) sum = 18

 (36) 对下面程序段正确的判断是:___________

      #  define  A  3

        # define  B(a)  (( A + 1 )*a )

            M

          x = 3*( A + B( 7 ) ) ;

A)  程序错误,不许嵌套宏定义         B)  x = 21

C)  x = 93                                        D)  程序错误,宏定义不许有参数。    

 

 (37) 执行以下程序后,a , b的值为  &llllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll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llllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll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llllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll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llllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll  f = 1 ;

    else  [3] ;

if (f ) printf ( " % d  is ", y );

else  printf ( " % d  is  not " , y) ;

Printf (" a leap year \ n ") ;

    }

(3)   以下程序是用梯形法求 sin( x ) * cos( x ) 的定积分,求定积分的公式为:

     

其中 xi = a + ih ,  h = (b - a )/n

  a = 0,  b = 1.2 为积分上下限,积分区间分割数 n = 100 ,

  # include  < stdio . h >

  # include  < math. h >

  main ( )

  { int  i , n;  double  h, s, a, b ;

    printf (" input a, b :");

    scanf ( "% lf % lf ", [4]);

    n = 100;  h = [5]

    S = 0.5 * ( sin( a ) * cos( a ) + sin( b ) * cos( b ) );

   for ( i = 1;  i <= n - 1;  i + +)  S+ = [6];

S* = h;

Printf (" S = % 10.4 lf\n ",S);           }

(4)   下面程序的运行结果是[7])

# include  " stdio.h "

 main ( )

 {int  i =1;

   while ( i < =15)

     if  ( + + i % 3! = 2 ) continue ;

     else  printf ( " % d " , i ) ;

   printf ( " \ n ") ;   }

 

(5)   下面程序段运行的结果是 [8]

i = 1;  s = 3;

do {s+ = i + + ;

   if (s % 7 = = 0)  continue;

   else  + + i;

   }  while (s < 15);

  printf ( " % d ", i );

以下程序是矩阵a, b的乘积:

    main ( )

{ int  a[3][2] = {2 , -1 , -4 , 0 , 3 , 1 } ;

  int  b[2][2] = { 7 , -9 , -8 , 10 }

  int  i , j , k , s , c[3][2] ;

  for  ( i = 0 ;  i < 3 ;  i + + )

  for  ( j = 0 ;  j < 2 ;  j + + )

  { for  ([9] ;  k < 2 ;  k + + )

     s + =  [10] ;

   c[i][j] = s ;   }

  for  ( i = 0 ;  i < 3 ;  i + + )

  { for  for  ( j = 0 ;  j < 2 ;  j + + )

    printf ( % 6d ", c[i][j] ) ;

        [11] }  }

 

(6)   设数组a包括10个整型元素。下面程序的功能是求出a 中各相邻两个元素的和,并将这些和存放在数组b中,按每行三个元素的形式输出。

     main ( )

{ int  a[10],  b[10] ,  i ;

  for ( i = 0;  i < 10;  i + +)

   scanf (" % d ", &a[i]);

  for ([12];  i < 10;  i + +)

       [13]

  for ( i = 1;  i < 10;  i + +)

      {printf ( " % 3d ", b[i]);

       if ( [14] = 0 )   printf ( " \ n " );

      }

 

(7)   以下程序的功能是根据公式 e的近似值,精度要求为   10-6.请填空.

   # include < stdio.h >

   main ( )

   {int  i ; double  e , new ;

     [15] new = 1.0

 for ( i = 1; [16] i + + )

 {new / = (double ) i ; e+ = new ; }

 printf ( " e = % f \ n ", e );  }

(8)   下面add函数的功能是求两个参数的和,并将和值返回调用函数中,错误的部分是

     [17]改正后为[18]

      Void  add (float  a ,  float  b )

      {float  c ;

       c = a + b ;

       return  c ;

       }

 

(9)           下面程序以每行4个数据的形式输出 a数组

# define   N  20

 main ( )

{ int a[N], i;

  for ( i = 0;  i < N;  i + +)  scanf (" % d ",  [19]);

 for ( i = 0;  i < N;  i + +)

  { if  ( [20] )  [21]

printf ( " % 3d ", a[i]);

       }

         printf ( " \ n " );

     }

(10)     以下程序是  Y4×1 = a4×4 × X4×1

main ( )

   { float  a[4][4] = { { 1, -0.2 , 0, 0 },

                            {-0.8, 1, -0.2, -0.2},

                               { 0, -0.8, 1, -0.2},

                               { 0, -0.8, -0.8, 1} ;

float  X[4] = { 1, 1, 1, 1 }, Y[4];

int  i , j , k;

for  ( i = 0;  i < 4;  i + +)

 { Y[i] = 0

   for  ( j = 0;  j < 4;  j + +)   [22]   }

   for  ( k = o;  k < 4;  k + + )

     printf ( " \ n Y[ % d] = % - 6.2 f " , k + 1, [23] );

 

(11)        函数 yang 能够按以下方式构成一个杨辉三角形:

       1

        1   1

1         2   1

        1   3   3   1

        1   4   6   4   1

          

# define  N 11

        yang ( int  a[ ] [N])

        { int  i,  j;

          for ( i = 1;  i < N;  i + +)  { a[i][1] = 1; a[i][i] = 1;}

           for ( [24];  i < N;  i + +)

             for ( j = 2;  [25];  i + +)  a[i][j] = [26] + a[ i - 1][j];

        }

(12)        若有定义:int a[2][3] = {1, 3, 5, 7, 9, 11}; a[1][0] 的值是[27], *( *(a + 1) + 0 )的值是[28]

 

(13)        下面程序运行结果是 [29]

# define  PE (z)  (z)*(z)

main ( )

{printf(" % d\n", PE (1 + 2) + 3);

}

(14)        下面程序是将字符串b复制到字符串a

# include  " stdio. h "

 S ( char  *s,  char  *t )

{ int  i = 0 ;

  while  ([30]) [31] ; }

 main ( )

 {char  a[20], b[10];

  scanf ( "% S", b);

  S([32]);

  Puts (a);

 }

(15)        若有定义:int a[2][3] = {2, 4, 6, 8, 10, 12}; *{& a[0][0] + 2*2+ 1} 的值是[33], *( a[1] + 2)的值是[34]

(16)        下面程序运行结果是 [35]

# define  f (r)  r * r

main ( )

{ int  x = 1 ,  y = 2 ,  t ;

  t = f (x + y);

  printf(" % d \ n ", t );

}

(17)        若已定义:

{struct  num

{ int  a; 

  int  b;

  float  f ;

} n = {1, 3, 5.0 };

struct num  * pn = &n ;

则表达式 pn->b/n.a*++pn->b+pn->f 的值是[36]表达式(*pn).a+pn->f的值是[37]

(18)        以下程序运行的结果是 [38]

main ( )

{struct  EXA { struct { int  x ;  int  y ;} in;

              int  a;

              int  b;} e ;

  e.a = 1;  e.b = 2;

  e.in.x = e.a*e.b

  e.in.y = e.a + e.b;

 printf ( " % d, % d ",  e.in.x;  e.in.y);

}