【单选题】
执行下列程序后，其输出成果是___ main() {int a=9; a+=a-=a+a; printf(“%d\n”,a);}
A. 18
B. 9
C. -18
D. -9
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答案
C
解析
暂无解析
相关试题
【单选题】
若int类型数据占两个字节，则下列语句的输出是___ int k=1; printf(“%d,%u\n”,k,k)
A. -1,-1
B. -1,32767
C. -1,32768
D. -1,65535
【单选题】
若k,g均为int变量，则下列语句的输出为___ k=017; g=111; printf(“%d\t”,++k); printf(“%x\n”,g++)
A. 15 6f
B. 16 70
C. 15 71
D. 16 6f
【单选题】
以下程序的输出结果是___ main() {int i=010;j=10; printf(“%d,%d\n”,++i,j--);}
A. 11,10
B. 9,10
C. 010,9
D. 10,9
【单选题】
C语言中以下几种运算符的优先次序的排列是正确的___
A. 由高到低为：！，&&，||，算术运算符，赋值运算符
B. 由高到低位：！，算术运算符，关系运算符，&&，||，赋值运算符
C. 由高到低为：算术运算符，关系运算符，赋值运算符，！，&&，||
D. 由高到低为：算术运算符，关系运算符，！，&&，||，赋值运算符
【单选题】
以下程序的输出结果为___ main() {float x=3.6; int i; i=(int)x; printf(“x=%f,i=%d\n”,x,i)}
A. x=3.600000,i=4
B. x=3,i=3
C. x=3.600000,i=3
D. x=3 i=3.600000
【单选题】
以下程序的运算结果是___ main() {int i=0,sum=0; while(i<20) sum=sum+1;i++; printf(“i=%d,sum=%d”,i,sum);}
A. i=10,sum=9
B. i=9,sum=9
C. i=2,sum=1
D. 运行出现错误
【单选题】
以下程序的运行结果为___ main() {int n; for(n=1;n<=10,n++){ if(n%3==0)continue; printf(“%d”,n);}}
A. 12457810
B. 369
C. 12
D. 123456789
【单选题】
在C语言中，if语句后的一对原括号中，用以决定分支的流程的表达式___
A. 只能用逻辑表达式
B. 只能用关系表达式
C. 只能用逻辑表达式或关系表达式
D. 可用任意表达式
【单选题】
假定所有变量均为已正确定义，下列程序段运行后x的值是___ k1==1; k2=2; k3=3; x=15; if(!k1)x--; else if(k2) x=4; else x=3
A. 14
B. 4
C. 15
D. 3
【单选题】
执行下列语句后的输出为___ int j=-1; if(j<=1) printf(“****\n”); else printf(“%%%%\n”)
A. ****
B. %%%%
C. %%%%c
D. 有错，执行不正确
【单选题】
下列程序的输出结果是___ main() {int x=1,y=0,a=0,b=0; switch(x){case 1;switch(y){case 0;a++;break; case1;b++;break;}}}
A. a=1,b=0
B. a=2,b=1
C. a=1,b=1
D. a=2,b=2
【单选题】
下列程序的输出为___ main() {int y=10; while(y--); printf(“y=%d\n”,y);}
A. y=0
B. while构成无限循环
C. y=1
D. y=-1
【单选题】
设j和k都是int类型，则for循环语句 for（j=0,k=1;k++） printf(“****\n”);___
A. 循环结束的条件不合法
B. 是无限循环
C. 循环体一次也不执行
D. 循环体只执行一次
【单选题】
下列数组说明中，正确的是___
A. static char str[]=“China”
B. static char str[];str=“China”
C. static char str1[5],str2[]={“China”}; str1=str2
D. static char str1[],str2[];str2={“China”};strcpy(str1,str2)
【单选题】
下列定义数组的语句中正确的是___
A. #define size 10 char str1[size],str2[size+2]
B. char str[]
C. int num[‘10’]
D. int n=5;int a[n][n+2]
【单选题】
下列定义数组的语句中不正确的是___
A. static int a[2][3]={1,2,3,4,5,6}
B. static int a[2][3]={{1},{4,5}}
C. static int a[][3]={{1},{4}}
D. static int a[][]={{1,2,3},{4,5,6}}
【单选题】
下列语句中，不正确的是___
A. static char a[2]={1,2}
B. static int a[2]={‘1’,‘2’}
C. static char a[2]={‘1’,‘2’,‘3’}
D. static char a[2]={‘1’}
【单选题】
若输入ab,程序运行结果为___ main() { static char a[3]; scanf(“%s”,a); printf(“%c,%c”,a[1],a[2]);}
A. a,b
B. a,
C. b,
D. 程序出错
【单选题】
关于return语句，下列正确的说法是___
A. 不能在主函数中出现且在其他函数中均可出现
B. 必须在每个函数中出现
C. 可以在同一个函数中出现多次
D. 只能在除主函数之外的函数中出现一次
【单选题】
在C语言程序中___
A. 函数的定义可以嵌套，但函数的调用不可以嵌套
B. 函数的定义不可以嵌套，但函数的调用可以嵌套
C. 函数的定义和函数的调用均可以嵌套
D. 函数的定义和函数的调用不可以嵌套
【单选题】
C语言程序中，当调用函数时___
A. 实参和虚参各占一个独立的存储单元
B. 实参和虚参可以共用存储单元
C. 可以由用户指定是否共用存储单元
D. 计算机系统自动确定是否共用存储单元
【单选题】
以下描述中，正确的是___
A. 预处理是指完成宏替换和文件包含中指定的文件的调用
B. 预处理指令只能位于C源文件的开始
C. C源程序中凡是行首以#标识的控制行都是预处理指令
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【单选题】
执行下面程序后，输出结果是___ main() { a=45,b=27,c=0; c=max(a,b); printf(“%d\n”,c);} int max(x,y) int x,y; {int z; if(x>y) z=x;}
A. 45
B. 27
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【单选题】
以下程序的输出结果为___ main() {int a=1,b=2,c=3,d=4,e=5; printf(“%d\n”,func((a+b,b+c,c+a),(d+e)));} int func(int x,int y) {return(x+y);}
A. 15
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【单选题】
设j和k都是int 类型，则下面的for循环语句___ for(j=0.k=0;j<=9&&k!=876;j++) scanf(“%d”,&k)
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【单选题】
下列程序段的输出结果为___ float k=0.8567; printf(“%06.1f%%”,k*100)
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