Question

我需要编写一个java程序，将整数数组中的偶数和奇数分开。

这是我到目前为止所做的：这部分是完美的：

package Homework;
import java.util.*;
public class EvenOdd
{
public static void main(String[] args)
{
    // TODO Auto-generated method stub
    System.out.println("Please enter 10 integers");
    int [] a= new int[10];
    Scanner sc = new Scanner(System.in);
    for(int i=0;i<a.length;i++)
    {
        System.out.print("The "+(i+1)+" integer = ");
        a[i]= sc.nextInt();
    }     

        System.out.println("\nThe resulting array");
        for(int i=0;i<a.length;i++)
        {
            for(int j=1;j<a.length;j++)
            {
                int temp;
                if(a[i]%2!=0 && a[j]%2==0 && j>i)
                {
                    temp=a[j];
                    a[j]=a[i];
                    a[j]=temp;
                    break;     //There seems to be some problem in this loop
                }
            }
            System.out.println("The "+(i+1)+" integer = "+a[i]);
        }

Answer 1

如果你使用模数%2，你应该能够找到数字是偶数还是奇数，因为偶数数字mod 2将等于0而奇数数字mod 2将等于1。

尝试使用此方法对数组进行排序：

    for(int i=0;i<count;i++)
    {
        if(a[i] %2 != 0){//even
            int temp = a[i];
            a[i--] = a[count--];
            a[count+1] = temp;
        }
    }

Answer 2

介绍两个Integer类型的ArrayLists list1和list2。将偶数和list1和奇数放入list2。将两者合并到list1中。

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Answer 3

import java.util.*;
class main11
{
    public static void main(String args[])
    {
        Scanner sc=new Scanner(System.in);
        System.out.println("Enter the range");
        int no=sc.nextInt();
        int a[]=new int[no];
        int i;
        System.out.println("Enter the elements");
        for(i=0;i<no;i++)
        {
            a[i]=sc.nextInt();
        }
        System.out.println("Even nos are");
        for(i=0;i<no;i++)
        {
            if(a[i]%2==0)
            { 
                System.out.println(a[i]);

            }

        }
        System.out.println("The odd nos are");
        for(i=0;i<no;i++)
        {
            if(a[i]%2!=0)
            { 
                System.out.println(a[i]);

            }

        }




        }

    }

Answer 4

我认为由于拼写错误，你的元素交换无效：

temp=a[j];
a[j]=a[i];
a[i]=temp;   //Should be a[i] and not a[j]
break;

您还可以通过在for循环中进行以下更改来减少迭代次数：

for(int i=0;i<a.length-1;i++)
{
     for(int j=i+1;j<a.length;j++)
     {
          int temp;
          if(a[i]%2!=0 && a[j]%2==0) //no need of the last condition

Answer 5

set_richcompare()

Answer 6

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        int j=0,k=0,n;
        Scanner scn = new Scanner(System.in);
        System.out.println("Enter number of element you want in your array:");
         n = scn.nextInt();
        int array[] = new int[n];
        System.out.println("Your array element is : ");
        for (int i=0;i<n;i++){
            array[i]= scn.nextInt();
        }

        int even[] = new int[n];
        int odd[] = new int[n];
        for (int i=0;i<n;i++){
            if (array[i] % 2 != 0){
                odd[j] = array[i];
                j++;
            }
            else{
                even[k] = array[i];
                k++;
            }
        }

        System.out.println("Odd Array");
        if (j>1)
        {
            for (int i=0;i<j-1;i++){
                System.out.println(odd[i]+",");
            }
            System.out.println(odd[j-1]);

        }
        else {
            System.out.println("No number");
        }
        System.out.println(" ");
        System.out.print("Even :");
        System.out.println("Odd Array");
        if (k>1)
        {
            for (int i=0;i<k-1;i++){
                System.out.println(even[i]+",");
            }
            System.out.println(even[k-1]);

        }
        else {
            System.out.println("No number");
        }


    }
}

编写一个Java程序，用于分隔整数数组中的偶数和奇数

6 个答案: