题解 | #简单计算器#

#include <stdio.h>

int main() {
    double a,b;
    char ch;
    scanf("%lf%c%lf",&a,&ch,&b);
    switch (ch) {
        case '+':printf("%.4f%c%.4f=%.4f",a,ch,b,a+b);break;
        case '-':printf("%.4f%c%.4f=%.4f",a,ch,b,a-b);break;
        case '*':printf("%.4f%c%.4f=%.4f",a,ch,b,b*a);break;
        case '/':if(b) {printf("%.4f%c%.4f=%.4f",a,ch,b,a/b);}
                else{printf("Wrong!Division by zero!");}
                break;
        default:printf("Invalid operation!");break;

    }
    
}