C++编写简易计算器

下面是一个简单的 C++ 计算器代码，可以进行加减乘除运算：

#include <iostream>
using namespace std;

int main() {
    char op;
    double num1, num2;

    cout << "请输入运算符 (+, -, *, /): ";
    cin >> op;

    cout << "请输入两个数字: ";
    cin >> num1 >> num2;

    switch(op) {
        case '+':
            cout << num1 << " + " << num2 << " = " << num1 + num2;
            break;

        case '-':
            cout << num1 << " - " << num2 << " = " << num1 - num2;
            break;

        case '*':
            cout << num1 << " * " << num2 << " = " << num1 * num2;
            break;

        case '/':
            cout << num1 << " / " << num2 << " = " << num1 / num2;
            break;

        default:
            // 如果运算符不是 +, -, *, 或 /，提示错误信息
            cout << "错误！您输入的运算符不正确";
            break;
    }

    return 0;
}