#include<stdio.h>
void main() 
{
	float a, b;
	char c;
	printf("请输入a(+-*/)b\n");
	scanf("%f%c%f",&a,&c,&b);
	switch (c)
	{
	case '+': printf("a+b=%f", a + b); break;
	case '-': printf("a-b=%f", a-b); break;
	case '*': printf("a*b=%f", a*b); break;
	case '/': printf("a+b=%f", a/b); break;
	}
		system("pause");
	
}