一、单项选择题（本大题共20小题，每小题1分，共20分）

在每小题列出的四个备选项中只有一个是符合题目要求的，请将其代码填写在题后的括号内。错选、多选或未选均无分。

1．下面哪种设备是输入设备？(     )

A.键盘                                                      B．打印机

C．显示器                                                D．投影仪

2．与十进制39等值的二进制数是(     )

A.00100111                                               B.01001001

C.10100111                                               D.01011000

3．设有 int a=3，b=-4;表达式(a<b)? a b：（a-b，b 4，a-=b 4）的值是(     )

A.-1                                                          B．0

C．3                                                        D．7

4．设有int a=3,b=-4，c=5;表达式a=b=c=6 3/5的值是(     )

A.3                                                           B．4

C．6                                                        D．6.6

5．以十进制无符号形式输出整数的格式说明符是(     )

A. %u                                                       B．% x

C．%o                                                     D．%d

6．下列程序段执行后的输出结果为

int i =-1;

if(i<=0)    printf(＂* * * * \n＂);

else printf (＂%%%%＼n＂);  (      )

A. * * * * c                                               B.% % % %

C. % % % % c                                          D.** * *

7．执行下面程序段后的y值是

int y=l, x=5；

if(x<0)y=-1；

if(x>=0)y=0;  (      )

A.-1                                                          B．0

C．1                                                        D．5

8．执行while（表达式）结构循环的条件是(     )

A．当表达式的值为0时                           B．仅当表达式的值为l时

C．当表达式的值为非0时                       D．当表达式的值不为1时

9．下面程序段的输出结果是

a=100;

while (a>120)

a= a l;

printf (＂%d", a);  （      ）

A.100                                                       B．101

C．120                                                     D.121

10.下面程序执行后，i的值是

main()

{   int  a[5]={1,2,3,4,5），i =2;

printf (＂%d＂，a[ i ])；

} (      )

A．1                                                        B．2

C．3                                                        D．4

11.关于函数调用以下错误的描述是(      )

A.函数调用可以出现在执行语句中

B．函数调用可以出现在一个表达式中

C．函数调用可以作为一个函数的实参

D．函数调用可以作为一个函数的形参

12.C语言关于递归调用的规则是(     )

A.既允许直接递归调用，也允许间接递归调用

B．不允许直接递归调用，也不允许间接递归调用

C．允许直接递归调用，不允许间接递归调用

D．不允许直接递归调用，允许间接递归调用

13.设有语句int a[4][10]，* p= * a；则下列表达式中属于地址表达式的是(     )

A．a[1][2]                                                B．a[1]

C. * (p 1 * 10 2)                                    D.*(a[1] 2)

14.下面声明语句正确的是(     )

A. int a, * p=a;                                           B.inta, * p = & a;

C. int * p= a,a;                                           D.int* p = & a, a;

15.下面定义不正确的是(     )

A. struct star                                             B.structstar

{                                  {

int id;                              int id;

char * name;                         char * name;

}starl = {1001,"Moon"};                }; starl = {1001,"Moon"};

C. struct                                                   D.struct star

{                                   {

int id ;                               int id ;

char * name ;                           char* name ;

} starl = {123,"Sun"} ;                  } starl ;

16.下面列出的位运算符中，表示按位异或操作的是(     )

A.～                                                         B．！

C．^                                                         D．&

17.下面各个位运算符的优先级从左到右依次升高的是(     )

A. | ^ & > >                                               B.^ > > & ～

C. > > | ^ ～                                             D.～ | & > >

18．设有说明：int u=l，v=14;

表达式u -v > >2的值是 (      )

A.0                                                           B．3

C．4                                                        D．7

19.如果文件存储的是数据在内存中时存放的字节形式，则该文件是(     )

A.ASCII码文件                                        B．文本文件

C．二进制文件                                         D．设备文件

20.正确使用fopen函数打开C盘根目录下abc . dat文件进行读写的语句是(     )

A. fopen (＂c:\abc.dat＂,＂w ＂);              B.fopen(＂c:\adc.dat＂,＂r ＂);

C. fopen(＂c:\\abc.dat＂,＂w＂);                D.fopen(＂c:\\abc.dat＂,＂r ＂):

二、多项选择题（本大题共5小题，每小题2分，共10分）

在每小题列出的五个备选项中至少有两个是符合题目要求的，请将其代码填写在题后的括号内。错选、多选、少选或未选均无分。

21.下面属于合法的C标识符有(          )

A._123                                                      B．abc

C．123_                                                   D．abc.c

E．ab_123

22.若所用变量已正确定义，以下各程序段执行后，变量x值相等的有(          )

A．x=0;                                                    B．x=0；i=0；

for (i=0;i<=3;i )                     while(i<3)

x=i x;                           {   x=i x；

                                          i ；

}

C．for（i=0；i<5；i ）                        D．x=0；i=0；

x=i x;                          lop： x=i x；

                                            i ；

                                             if( i < =3) goto lop;

E．i=0；x=0；

do{ x=x i；i=i 1；

}while(i<=3);

23.设有声明int x[5]={2,4,6,8,10）；下面表达式的结果为2的有(          )

A.a[o]                                                       B.a[3]-a[2]

C.(a[4]-a[2])/2                                           D.a[3]-a[0]

E.a[0]/2 a[l]/4

24.设有如下定义及赋值：

int a[5]={1,2,3,4,5), * p;

p=a;

则可以输出元素值为3的语句有(          )

A. printf (＂%d\n＂,a 2);                           B.printf (＂%d\n",p 2);

S. printf (＂%d＼n＂,p[2]);                        D.printf (＂%d＼n＂,* (p 2));

E. printf (＂%d＼n＂,a[3]);

25.下面关于结构体类型的定义正确的有(          )

A. struct ABC                                            B.struct tree

{                                   {

int a,                                int branch;

char b,                              char name[20];

char * p,                             char * relation;

};                                  };

C. struct ABC                                            D.struct tree

{                                                              {

int a;                                                         intbranch,

char b;                                                      charname[20],

char *p ;                                                   char*relation,

};                                                             };

E. struct

{

char name[20];

int weight;

int sex;

};