Anyone know how to increment and decrement at the same time and put the output side by side?

Question

Write an application that will ask the user to input a number. Your program will then display a number that starts and ends based on the number you entered and on the right side to reverse the numbers you displayed on the left side.

Expected output:

Enter a number: 5
1 5
2 4
3 3
4 2
5 1

I tried making a hollow box with increasing and decreasing numbers and making the other codes a comment to try and make the expected output. But I still can't manage to do so.

import java.util.Scanner;
public class MyClass {
public static void main(String args[])
{
    System.out.print("Enter a number: ");
    Scanner input = new Scanner (System.in);
    int num = input.nextInt();
    System.out.print("\n");

    for (int i = 0; i < num; ++i) {
        for (int j = 0; j < num; ++j) {
            if (i == 0) {
                System.out.print((j + 1) + " ");
            //} else if (i == num-1) {
                System.out.print((num - j) + " ");
            } else if (j == 0) {
                System.out.print((i + 1) + " ");
            //} else if (j == num-1) {
                System.out.print((num - i) + " ");
            //} else {
                System.out.print("  ");
            }
        }
        System.out.println();
        }
    }
} 

Answer 1

You're thinking too hard (;->). It's not so complicated.

Here's one possible way:

public class MyClass {
public static void main(String args[])
{
    System.out.print("Enter a number: ");
    Scanner input = new Scanner (System.in);
    int num = input.nextInt();
    System.out.print("\n");
    int i = 1;
    int j = num;
    while (i >= num) {
        System.out.println(i + " " + j);
        i++;
        j--;
    }
} 

Here's another:

public class MyClass {
public static void main(String args[])
{
    System.out.print("Enter a number: ");
    Scanner input = new Scanner (System.in);
    int num = input.nextInt();
    System.out.print("\n");
    for (int i = 1; i <= num; ++i) {
        System.out.println(i + " " + (num - i + 1));
    }
}