题解 | #简单计算器#

#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#include <string.h>

int main() {
    double op1 = 0;
    double op2 = 0;
    char op = 0;

    while (3 == scanf("%lf%c%lf", &op1, &op, &op2)) {
        if ('*' == op) {
            printf("%.4lf*%.4lf=%.4lf", op1, op2, op1 * op2);
        } else if ('+' == op) {
            printf("%.4lf+%.4lf=%.4lf", op1, op2, op1 + op2);
        } else if ('-' == op) {
            printf("%.4lf-%.4lf=%.4lf", op1, op2, op1 - op2);
        } else if ('/' == op) {
            if (0.0 == op2) {
                printf("Wrong!Division by zero!");
            } else {
                printf("%.4lf/%.4lf=%.4lf", op1, op2, op1 / op2);
            }
        } else {
            printf("Invalid operation!");
        }
        printf("\n");
    }
    return 0;
}