题解 | 简单计算器

#include <stdio.h>

int main() {
    double a,b;
    char c;
    while (scanf("%lf%c%lf", &a,&c,&b) != EOF) {
        getchar();
        if(c=='/'&&b==0.0){
        printf("Wrong!Division by zero!\n");    
        }
        if(c=='+')
        printf("%.4f%c%.4f=%.4f\n",a,c,b,a+b);  
        if(c=='-')  
        printf("%.4f%c%.4f=%.4f\n",a,c,b,a-b);
        if(c=='*')  
        printf("%.4f%c%.4f=%.4f\n",a,c,b,a*b); 
        if(c=='/'&&b!=0.0)  
        printf("%.4f%c%.4f=%.4f\n",a,c,b,a/b); 
        else if(c!='+'&&c!='-'&&c!='*'&&c!='/'){
        printf("Invalid operation!\n");
        }

    }
    return 0;
}