题解 | #简单计算器#

#include <stdlib.h>
#include<stdio.h>
#include<math.h>
int main(){
    double a,b,m;
    char c;
    scanf("%lf %c %lf",&a,&c,&b);
    if(c=='/'){
    	if(b==0.0){
    		printf("Wrong!Division by zero!");
		}
		else printf("%.4lf/%.4lf=%.4lf",a,b,a/b);
	}
    else if(c=='*'){
    	printf("%.4lf*%.4lf=%.4lf\n",a,b,a*b);
	}
	else if(c=='+'){
		printf("%.4lf+%.4lf=%.4lf\n",a,b,a+b);
	}
	else if(c=='-'){
		printf("%.4lf-%.4lf=%.4lf\n",a,b,a-b);
	}
    else
    printf("Invalid operation!");
	return 0;	
}