Question

我有一个问题要求用户输入两个数字。然后，您必须在这两个数字之间打印偶数...如果第一个数字小于第二个数字，则偶数将从小到大打印。如果第一个数字较大，则它们从最大到最小打印。我很困惑，我的代码显示......

import java.util.Scanner;
public class Lab605{ //create for loops to find given output. 
   public static void main(String[] args){

   int num1, num2;
   Scanner keyboard = new Scanner(System.in);

   System.out.print("Please type a number: "); 
   num1 = keyboard.nextInt();
   System.out.print("Enter another number: ");
   num2 = keyboard.nextInt();

   int i = 0;
   while ( i <= num1){
      if(num1 < num2){
         if(i%2 == 0){
         System.out.print("The even numbers between " + num1 + " and    " + num2+ " are: " + i);
      i++;
      }
      }
    }
   }
}

有人可以帮助指导我如何正确地执行此操作吗？还需要使用while循环！

Answer 1

试试这个：

public static void main(String[] args) {

    int num1, num2;
    Scanner keyboard = new Scanner(System.in);

    System.out.print("Please type a number: ");
    num1 = keyboard.nextInt();
    System.out.print("Enter another number: ");
    num2 = keyboard.nextInt();
    int i = 0;
    int l, s;
    boolean upToDown = false;
    if (num1 > num2) {
        l = num1;
        s = num2;
        upToDown = true;
    } else {
        l = num2;
        s = num1;
    }

    if (upToDown) {
        i = l % 2 == 0 ? l : l - 1;

        while (i - s > 0) {
            System.out.println(i - 2);
            i = i - 2;
        }
    } else {
        i = s % 2 == 0 ? s : s + 1;

        while (l - i > 0) {
            System.out.println(i + 2);
            i = i + 2;
        }
    }

}

Answer 2

检查下面的代码，我添加了评论。我想你可以理解，

import java.util.Scanner;

public class Lab605 { // create for loops to find given output.
    public static void main(String[] args) {

        int num1, num2;
        Scanner keyboard = new Scanner(System.in);

        System.out.print("Please type a number: ");
        num1 = keyboard.nextInt();
        System.out.print("Enter another number: ");
        num2 = keyboard.nextInt();

        int smallNum = 0; // Identify small number
        int largeNum = 0; // Identify large number
        boolean isNum1Large = false;
        if (num1 - num2 > 0) {
            smallNum = num2;
            largeNum = num1;
            isNum1Large = true;
        } else {
            smallNum = num1;
            largeNum = num2;
        }

        if (isNum1Large) { //If first number is large
            for (int i = largeNum - 1; i > smallNum; i--) {
                if (i % 2 == 0) {
                    System.out.println(i);
                }
            }
        } else { //If first number is small
            for (int i = smallNum + 1; i < largeNum; i++) {
                if (i % 2 == 0) {
                    System.out.println(i);
                }
            }
        }
    }
}

如何在2个输入之间显示偶数并且取决于num1＆gt; num2，反之亦然

2 个答案: