C语言基础复习题.docx

C语言基础复习题.docx

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C语言基础复习题

C语言复习题

（1）

一、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）-100x8f-011B）010-0x110xf1

C）0abc-0170xcD）0a12-0x123-0xa

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

A）0~65535B）0~32767

C）-32767~32768D）-32768~327687

（5）若有定义：

inta=7;floax=2.5,y=4.7;

则表达式x+a%3*（int）（x+y）%2/4的值是。

A）2.750000B）0.00000C）3.500000D）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

z||1）B）'x'&&'y'C）x||y+z&&y-zD）x<=y

（8）设有程序段

intk=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（）

{longy=23456;

printf（"y=%3x\n",y）;

printf（"y=%8x\n",y）;

printf（"y=%#8x\n",y）;

}

A）y=5ba0B）y=5ba0C）y=5ba0D）y=5ba0

y=5ba0y=5ba0y=bba0y=5ba0

y=0x5ba0y=0x5ba0y=0x5ba0y=####5ba0

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

if（a

if（c

else

if（a

if（b

elsex=3;

elsex=6;

elsex=7;

A）1B）3C）2D）6

（11）下面程序的运行结果是。

#include"stdio.h"

main（）

{inta=1,b=10

do

{b-=a;a++;}

while（b--<0）;

printf（"a=%d,b=%d\n）,a,b）;

A）a=3,b=11B）a=4,b=9

C）a=1,b=-1D）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：

inta[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：

floatf1,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）;}elseprintf（"%f",-x）;

elseprintf（"%f",-x）;

C）if（x>0）D）if（x>0）

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

elseprintf（"%f",-x）;elseprintf（"%f",-x）;

（18）若W=1,X=2,Y=3,Z=4则条件式：

W

W:

Y

Y:

Z的值是。

A）1B）3C）4D）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1B）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、1、           main（）5、scanf（"%d",&a）;

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

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

4、4、           inti;8、}

A）3B）6C）5D）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）inta（10）B）intn=10;a[n];

C）intn;D）#defineSIZE10

scanf（"%d",&n）;inta[SIZE];

inta[n];

（24）下面程序的运行结果是。

a=1;b=2;c=2;

while（a

printf（"%d,%d,%d",a,b,c）;

A）1,2,0B）2,1,0C）1,2,1D）2,1,1

（25）若有说明：

inta[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。

inta[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+jB）j*m+iC）i*m+j-1D）i*m+j+1

（28）以下程序段运行的结果是。

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

printf（"%s",c）;

A）'a''b'B）abcC）abcD）ab

（29）以下正确的函数定义形式是。

A）doublefun（intx,inty）B）doublefun（intx;inty）

C）doublefun（intx,inty）;D）doublefun（intx,inty）;

（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（）

{inta=2,i;

for（i=0;i<3;i++）printf（"%4d",f（a））;

}

f（inta）

{intb=0;staticintc=3;

b++;c++;

return（a+b+c）;}

A）777B）71013C）789D）7911

（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）#definef（x）4*x*x+3*x+2B）#definef4*x*x+3*x+2

C）#definef（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

c

def

（表示回车）则下面程序的运行结果是。

#include"stdio.h"

#defineN6

main（）

{charc（N）;

inti=0;

for（;i

for（i=0;i

}

A）abcdefB）aC）bD）ab

bcc

cdd

d

e

f

（35）请读程序：

#defineAD（x）x+x

main（）

{intm=1,n=2,k=3;

intsum=AD（m+n）*k;

printf（"sum=%d",sum）;}

上面程序的运行结果是。

A）sum=9B）sum=10C）sum=12D）sum=18

（36）对下面程序段正确的判断是:

___________

#defineA3

#defineB（a）（（A+1）*a）

x=3*（A+B（7））;

A）A） 程序错误，不许嵌套宏定义。

B）x=21

C）x=93D）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&lllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll