C语言复习题

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。

(1）C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 __ __。

A）0 ~ 65535 B）0 ~ 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 __ __。

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

(7) 设x , y和z是int型变量，且x = 3, y = 4 , z = 5 则下面表达式中值为0的

是
__ __。

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 B）y = 5ba0 C ) y = 5ba0 D）y = 5ba0

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

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

(10) 当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 ;

A）1 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 );

A）a = 3 , b = 11 B）a = 4 , b = 9

C）a = 1 , b = -1 D）a = 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。 B）4次。 C）0次 。 D）3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 ] B）a[10 - 10] C）a ( 5 ) D）a[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

A）scanf ("%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 __ __。

A）ch = '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) 若 W=1, X=2, Y=3, Z=4 则条件式：

W < X？ W : Y < Z ? Y : Z 的值是 __ __。

A）1 B）3 C）4 D）2

(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0或1 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 ( ) 5、scanf ( "% d ",& a ) ;

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

3、 int a[3 ] = {1}; 7、printf ( " 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) 当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 __ __。

A）int 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 __ __。

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

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

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

A) i * m + j B）j * m + i C) i*m + j -1 D）i * 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 __ &lllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll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llllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll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lllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll 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 x_{i} = a + ih ,
h = (b - a )/n

设 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 _{}求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 Y_{4}_{×1 }= a_{4}_{×4 }× X_{4}_{×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}; 则 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}; 则 *{& 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);

}