Java语言程序设计 例题3.17（游戏：石头剪刀布）

*3.17 (Game: scissor, rock, paper) Write a program that plays the popular scissor-rockpaper game. (A scissor can cut a paper, a rock can knock a scissor, and a paper can wrap a rock.) The program randomly generates a number 0, 1, or 2 representing scissor, rock, and paper. The program prompts the user to enter a number 0, 1, or 2 and displays a message indicating whether the user or the computer wins, loses, or draws. Here are sample runs: scissor (0), rock (1), paper (2): 1 The computer is scissor. You are rock. You won scissor (0), rock (1), paper (2): 2 The computer is paper. You are paper too. It is a draw

*3.17（游戏：石头剪刀布）编写一个程序，玩流行的石头剪刀布游戏。（剪刀可以裁纸，石头可以敲剪刀，纸可以包石头。）程序随机生成代表剪刀，石头和布的数字是0，1或2.程序提示用户输入数字0，1或2，并显示一条消息，表明用户或计算机是输，赢还是平局。下面是一些运行示例：

scissor (0), rock (1), paper (2): 1 The computer is scissor. You are rock. You won scissor (0), rock (1), paper (2): 2 The computer is paper. You are paper too. It is a draw

代码如下：

import java.util.Scanner;
public class Unite3Test17 {
	public static void main(String[] args) 
	{
		Scanner input=new Scanner(System.in);
		System.out.println("请输入数字0，1或2：");
		int num=input.nextInt();
		int result=(int)(Math.random()*3);
		if(result==0&&num==0) 
		{
			System.out.println("The computer is scissor. You are scissor too.It is a draw");
		}else if(result==0&&num==1) 
		{
			System.out.println("The computer is scissor. You are  rock.You won");
		}else if(result==0&&num==2) 
		{
			System.out.println("The computer is scissor. You are  paper.You lose");
		}
		if(result==1&&num==0) 
		{
			System.out.println("The computer is rock. You are scissor .You lose");
		}else if(result==1&&num==1) 
		{
			System.out.println("The computer is rock. You are rock too.It is a draw");
		}else if(result==1&&num==2) 
		{
			System.out.println("The computer is rock. You are paper.You won");
		}
		if(result==2&&num==0) 
		{
			System.out.println("The computer is paper. You are scissor .You wom");
		}else if(result==2&&num==1) 
		{
			System.out.println("The computer is paper. You are rock too.You lose");
		}else if(result==2&&num==2) 
		{
			System.out.println("The computer is paper. You are paper too.It is a draw");
		}
	}

}

结果如下：