题解 | 简单计算器

#include <stdio.h>

int main() {
    double x1, x2 = 0;
    char operate = 0;
    double result = 0;
    scanf("%lf%c%lf",&x1,&operate,&x2);
    switch (operate) {
        case '+':
        result = x1 + x2;
        printf("%.4lf+%.4lf=%.4lf",x1,x2,result);
        break;
        case '-':
        result = x1 - x2;
        printf("%.4lf-%.4lf=%.4lf",x1,x2,result);
        break;
        case '*':
        result = x1 * x2;
        printf("%.4lf*%.4lf=%.4lf",x1,x2,result);
        break;
        case '/':
        if (x2 == 0.0) {
            printf("Wrong!Division by zero!");
            break;
        }
        result = x1 / x2;
        printf("%.4lf/%.4lf=%.4lf",x1,x2,result);
        break;
        default:
        printf("Invalid operation!");
    }
    return 0;
}