{y+=x;printf("y=%d\n",y);}

else

{y=x;printf("y=%d",y);}

}

A)y=41 B)y=43 C)y=42 D)y=1

49、运行下面程序时，从键盘输入"12,34,9"，则输出结果是___A___.

#include

void main()

{int x,y,z;

scanf("%d,%d,%d",&x,&y,&z);

if(x

if(y

else printf("%d\n",y);

else if(x

else printf("%d\n",x);

}

A)34 B)12 C)9 D)不确定的值

50、运行下面程序时，从键盘输入字母H，则输出结果是_____C___.

#include

void main()

{char ch;

ch=getchar();

switch(ch)

{case'H':printf("Hello!\n");

case'G':printf("Good morning!\n");

default:printf("Bye_Bye!\n");

}

}

A)Hello!B)Hello!

Good Morning!

C)Hello!D)Hello!

Good morning!Bye_Bye!

Bye_Bye!

51、执行下列程序段后的输出结果是_____A____.

int x=1,y=1,z=1;

x+=y+=z;

printf("%d\n",x

A)3 B)2 C)1 D)4

52、设ch是char型变量,值为'A',则表达式ch=(ch>='A'&&ch<='Z')?ch+32:ch的值是__B___.

A)Z B)a C)z D)A