#include
#include
int main()
{
double x,y,r;
char a;
printf("请输入表达式\n");
scanf("%f,%c,%f",&x,&a,&y);
switch(a)
{
case '+':
r=x+y;
break;
case '-':
r=x-y;
break;
case '*':
r=x*y;
break;
case '/':
r=x/y;
break;
}
printf("结果是:%f",r);
Sleep(10000);
return 0;
}