无法到达的声明?

Unreachable statement?(无法到达的声明?)

问题描述

这是我的编码:出于某种原因，最后，当我试图返回 winscounter 和 losscounter 时，它说的是无法访问的语句，但不是针对 tiescounter 的.我不知道为什么！如果有人能回答这个问题，将不胜感激！

Here is my coding: For some reason, at the very end, when I'm trying to return winscounter and losscounter, it says unreachable statement but not for the tiescounter. I can't figure out why! If anyone can answer this, it would be greatly appreciated!!

public class RockPaperScissors {

    /**
     * @param args the command line arguments
     */

    static int value;  //computer's choice
    static int choice; //user choice
    static int tiescounter = 0;
    static int winscounter = 0;
    static int losscounter = 0;

    public static void main(String[] args) throws IOException {

        BufferedReader br = new BufferedReader (new InputStreamReader (System.in));// user input

        int repeat;

        do {
            System.out.println("ROCK PAPER SCISSORS"+
                    "
===================");
            System.out.println("
1=Rock" +
                    "
2=Paper" +
                    "
3=Scissors" +
                    "
===========" +
                    "
Choose:");

            choice = Integer.parseInt(br.readLine());

            if (choice !=1 && choice !=2 && choice !=3) {

                do{
                    System.out.println("
Error. Please choose Rock, Paper or Scissors.");
                    choice = Integer.parseInt(br.readLine());
                }
                while (choice !=1 && choice !=2 && choice !=3);
            }

            System.out.println();

            if (choice == 1){
                System.out.println("You have chosen Rock.");
            }
            else if (choice ==2){
                System.out.println("You have chosen Paper.");
            }
            else if(choice == 3){
                System.out.println("You have chosen Scissors.");
            }

            randomWholeNumber();

            if (value == 1){
                System.out.println("The computer has chosen Rock." );
            }
            else if (value == 2){
                System.out.println("The computer has chosen Paper." );
            }
            else if (value == 3){
                System.out.println("The computer has chosen Scissors." );
            }

            determineOutcome();
            System.out.println("Ties:"+ tiescounter);
            System.out.println("Wins: " + winscounter);
            System.out.println("Losses: " + losscounter);

            repeat = Integer.parseInt(br.readLine());

        }
        while (repeat==1);
    }

    public static int randomWholeNumber(){

        do{
            value=0;//resets random number
            //generates and returns a random number within user's range 
            value = (int) ((Math.random()*3)+1);
        } 
        while((value>3)||(value<1));
        return (value);
    }

    public static int determineOutcome(){

            if (value == choice){
                System.out.println("
YOU'VE TIED");

                do{
                    tiescounter+=1;
                }
                while (tiescounter != tiescounter);
            }

            else if (value == 1){ //Rock
                if (choice == 2){ //Paper
                    System.out.println("
YOU'VE WON");               
                    do{
                        winscounter +=1;
                    }
                    while (winscounter != winscounter);
                }
                else if (choice == 3){ //Scissors
                    System.out.println("
YOU'VE LOST");
                    do{
                        losscounter+=1;
                    }
                    while(losscounter!=losscounter);
                }
            }

            else if (value == 2){ //Paper
                if (choice == 1){ //Rock
                    System.out.println("
YOU'VE LOST");
                    do{
                        losscounter+=1;
                    }
                    while(losscounter!=losscounter);
                }
                else if (choice == 3){ //Scissors
                    System.out.println("
YOU'VE WON");

                    do{
                        winscounter +=1;
                    }
                    while (winscounter != winscounter);
                }
            }

            else if (value == 3){ //Scissors
                if (choice == 1){ //Rock
                    System.out.println("
YOU'VE WON");
                    do{
                        winscounter +=1;
                    }
                    while (winscounter != winscounter);                    
                }
                else if (choice == 2){ //Paper
                    System.out.println("
YOU'VE LOST");
                    do{
                        losscounter+=1;
                    }
                    while(losscounter!=losscounter);
                }
            }

            return(tiescounter);
            return(winscounter);
            return(losscounter);
    }
}

推荐答案

一个函数只能返回一个值.一旦 return(tiescounter); 被执行，函数就会退出.如果要返回所有三个值，则必须将它们包装在一个类中.

A function can only return one value. As soon as return(tiescounter); is executed the function exits. If you want to return all three values you will have to wrap them in a class.

顺便说一下，return(tiescounter); 可以写成 return tiescounter; 不需要在返回值周围加上括号.两个语句的结果相同.

By the way return(tiescounter); can be written as return tiescounter; Parenthesis around return values is not required. Both statements will have the same result.

这篇关于无法到达的声明?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！