cpp: class

 

#include <iostream>
#include <string>
using namespace std;class teacher {// 私有成员变量string name;float salary;  // 月薪float money;   // 奖金string date;   // 入职日期public:// 无参构造函数teacher() {name = "unknown";salary = 0;money = 0;date = "0";}// 带参构造函数（已修复！）teacher(string n, float s, float m, string d) {name = n;    // 正确赋值salary = s;money = m;date = d;}// 输入信息void input() {cout << "请输入姓名：";cin >> name;cout << "请输入月薪：";cin >> salary;cout << "请输入奖金：";cin >> money;cout << "请输入入职日期：";cin >> date;}// 计算月总收入float cmonth() {return salary + money;}// 计算年薪（修复：添加return）float cyear() {return cmonth() * 12;}// 显示所有信息（修复：完整输出）void disp() {cout << "\n===== 教师信息 =====" << endl;cout << "姓名：" << name << endl;cout << "入职日期：" << date << endl;cout << "月薪：" << salary << endl;cout << "奖金：" << money << endl;cout << "月总收入：" << cmonth() << endl;cout << "年薪：" << cyear() << endl;cout << "====================\n" << endl;}
};// 主函数（修复逻辑）
int main() {teacher t;int a;while (true) {  // 更清晰的循环cout << "退出请按 1，继续输入请按 2：";cin >> a;if (a == 1) {cout << "已退出程序" << endl;break;}if (a == 2) {t.input();   // 输入t.disp();    // 显示}}return 0;
}

　　

 

#include <iostream>
#include <cstdint>   // C++20 固定宽度整数类型
#include <stdexcept> // 异常处理// C++20 constexpr：允许编译期计算阿克曼函数
// uint64_t：64位无符号整数，防止数值溢出
constexpr uint64_t ackermann(uint64_t m, uint64_t n)
{// 限制输入范围，避免栈溢出/计算爆炸if (m > 4) {throw std::invalid_argument("m 不能大于 4，否则计算量极大且会栈溢出！");}// 阿克曼函数标准定义if (m == 0) {return n + 1;}else if (n == 0) {return ackermann(m - 1, 1);}else {return ackermann(m - 1, ackermann(m, n - 1));}
}int main()
{try {std::cout << "=== C++20 阿克曼函数演示 ===" << std::endl;// 编译期计算（C++20 新特性）constexpr auto a0 = ackermann(0, 5);constexpr auto a1 = ackermann(1, 5);constexpr auto a2 = ackermann(2, 3);constexpr auto a3 = ackermann(3, 4);std::cout << "ackermann(0, 5) = " << a0 << '\n';std::cout << "ackermann(1, 5) = " << a1 << '\n';std::cout << "ackermann(2, 3) = " << a2 << '\n';std::cout << "ackermann(3, 4) = " << a3 << '\n';// 注意：ackermann(4, 1) 已经非常大// ackermann(4, 2) 数值巨大，计算极慢}catch (const std::exception& e) {std::cerr << "错误：" << e.what() << '\n';return 1;}return 0;
}