Question

public class GuessingGame {

    public static void main(String[] args){
        double randomNumber = Math.floor((Math.random()*100)+1);
        Scanner userInputScanner = new Scanner(System.in);
        do {
            System.out.println("Enter your guess");
            System.out.println("\n");
            int Guess = userInputScanner.nextInt();

            if(Guess == randomNumber)

                System.out.print("Good");

                System.out.print("\n");

            else if(Guess < randomNumber)

                System.out.print("Higher");

                System.out.println("\n");

            else if(Guess > randomNumber)

                System.out.print("Lower");

                System.out.println("\n");
        }
        while(Guess != randomNumber);

    }
}

Answer 1

在if和if body下添加括号{}，Java在if else和indentation中不像python一样工作

if(Guess == randomNumber) { 
    System.out.print("Good");

    System.out.print("\n");

} else if(Guess < randomNumber) {

    System.out.print("Higher");

    System.out.println("\n");

} else if(Guess > randomNumber) {

    System.out.print("Lower");

    System.out.println("\n");
}

Answer 2

应该是这样的：

if(Guess == randomNumber){
    System.out.print("Good");

    System.out.print("\n");

}else if(Guess < randomNumber){

    System.out.print("Higher");

    System.out.println("\n");

}else if(Guess > randomNumber){

    System.out.print("Lower");

    System.out.println("\n");}

围绕if-else括号。

Answer 3

问题是您是否尝试将多个语句放在if块中而没有花括号。在其他语言中，缩进控制结构，但Java是自由格式的，因此没有大括号，只有一个语句被分组到每个if / else。

所以程序将第一个语句分组到if，然后下一个语句是单独的，那么你有一个else没有前一个if。

Answer 4

你需要在每个if条件之后添加{}，并且在执行while之前需要声明Guess变量在这里完整的代码，已经编译并且没有错误

import java.util.Scanner;

public class GuessingGame{



public static void main(String[] args){


double randomNumber = Math.floor((Math.random()*100)+1);
Scanner userInputScanner = new Scanner(System.in);
int Guess = 0;

do{

    System.out.println("Enter your guess");
    System.out.println("\n");

    Guess = userInputScanner.nextInt();

    if(Guess == randomNumber) {
        System.out.print("Good");
        System.out.print("\n");
    }
    else if(Guess < randomNumber) {
        System.out.print("Higher");
        System.out.println("\n");
    }
    else if(Guess > randomNumber) {
        System.out.print("Lower");
        System.out.println("\n");
    }
}
while(Guess != randomNumber);



}
}

Java“Else without if”错误。我做错了什么？

4 个答案: