用c++写一个石头剪刀布

好的，下面是一个简单的石头剪刀布游戏的 C++ 代码示例：

#include <iostream>
#include <cstdlib>
#include <ctime>

using namespace std;

int main()
{
    srand(time(NULL)); // 设置随机种子

    // 定义游戏选项
    const int ROCK = 1;
    const int SCISSORS = 2;
    const int PAPER = 3;

    // 定义玩家和电脑的选择
    int playerChoice, computerChoice;

    // 输出游戏提示信息
    cout << "Welcome to the rock-paper-scissors game!" << endl;
    cout << "Please input your choice (1 for rock, 2 for scissors, 3 for paper): ";

    // 获取玩家输入
    cin >> playerChoice;

    // 生成电脑选择
    computerChoice = rand() % 3 + 1;

    // 输出玩家和电脑的选择
    cout << "You choose ";
    switch (playerChoice) {
        case ROCK:
            cout << "rock." << endl;
            break;
        case SCISSORS:
            cout << "scissors." << endl;
            break;
        case PAPER:
            cout << "paper." << endl;
            break;
        default:
            cout << "invalid input." << endl;
            return 0;
    }

    cout << "Computer choose ";
    switch (computerChoice) {
        case ROCK:
            cout << "rock." << endl;
            break;
        case SCISSORS:
            cout << "scissors." << endl;
            break;
        case PAPER:
            cout << "paper." << endl;
            break;
        default:
            cout << "invalid input." << endl;
            return 0;
    }

    // 判断胜负
    if (playerChoice == computerChoice) {
        cout << "Draw!" << endl;
    } else if (playerChoice == ROCK && computerChoice == SCISSORS ||
               playerChoice == SCISSORS && computerChoice == PAPER ||
               playerChoice == PAPER && computerChoice == ROCK) {
        cout << "You win!" << endl;
    } else {
        cout << "Computer wins!" << endl;
    }

    return 0;
}

这个程序利用了随机数生成来实现电脑的选择，并采用了 switch-case 语句来输出玩家和电脑的选择。最后通过一系列的 if-else 判断来判断胜负，并输出游戏结果。