题解 | #简单计算器#

#include <stdio.h>

int main()
{
    double m = 0.0;
    double n = 0.0;
    char op = 0;

    //多组输入
    while (~scanf(" %lf%c%lf", &m, &op, &n))
    {
        switch (op)
        {
            case '+':
                printf("%.4lf+%.4lf=%.4lf\n", m, n, m + n);
                break;
            case '-':
                printf("%.4lf-%.4lf=%.4lf\n", m, n, m - n);
                break;
            case '*':
                printf("%.4lf*%.4lf=%.4lf\n", m, n, m * n);
                break;
            case '/':
                if (0 == n)
                {
                    printf("Wrong!Division by zero!\n");
                }
                else
                {
                    printf("%.4lf/%.4lf=%.4lf\n", m, n, m / n);
                }
                break;
            default:
                printf("Invalid operation!\n");
                break;
        }
    }

    return 0;
}