int main()

{

int a,b;

char ch;

printf("請輸入x=");

scanf("%d",&a);

printf("請輸入y=");

scanf("%d",&b);

printf("請輸入需要進行的運算:");

scanf("%c",&ch);

switch(ch)

case "+":

printf("x+y=%d\n",a+b);

break;

case "-":

printf("x-y=%d\n",a-b);

break;

case "*":

printf("x*y=%d\n",a*b);

break;

case "/":

if(b==0)

printf("分母不能為0\n");

else

printf("x/y=%d\n",a/b);

break;

default:

printf("輸入錯誤");

break;

return 0;

}

int main()

{

int a,b;

char ch;

printf("請輸入x=");

scanf("%d",&a);

printf("請輸入y=");

scanf("%d",&b);

printf("請輸入需要進行的運算:");

scanf("%c",&ch);

switch(ch)

case "+":

printf("x+y=%d\n",a+b);

break;

case "-":

printf("x-y=%d\n",a-b);

break;

case "*":

printf("x*y=%d\n",a*b);

break;

case "/":

if(b==0)

printf("分母不能為0\n");

else

printf("x/y=%d\n",a/b);

break;

default:

printf("輸入錯誤");

break;

return 0;

}