题解 | #简单计算器#

#include <iostream>
#include <bits/stdc++.h>
using namespace std;


int main() {

    double operand1 = 0, operand2 = 0;      //定义操作数和运算法变量
    char ope;
    cin >> operand1 >> ope >> operand2;     //输入操作数和运算法

    switch (ope) {
        case '+':
            cout << fixed << setprecision(4) << operand1 << "+" << operand2 << "=" <<
                 operand1 + operand2;
            break;
        case '-':
            cout << fixed << setprecision(4) << operand1 << "-" << operand2 << "=" <<
                 operand1 - operand2;
            break;
        case '*':
            cout << fixed << setprecision(4) << operand1 << "*" << operand2 << "=" <<
                 operand1* operand2;
            break;
        case '/': {
                if (operand2 == 0) {
                    cout << "Wrong!Division by zero!";
                } else {
                    cout << fixed << setprecision(4) << operand1 << "/" << operand2 << "=" <<
                         operand1 / operand2;
                }
            }
            break;
        default:
            cout << "Invalid operation!";
            break;
    }


    system("pause");
    return 0;
}