Java Program to Print Matrix in Snake Number Pattern

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Printing Matrix in Snake Number Pattern

In the previous article, we have discussed Java Program to Print Square with Right Rotate N-Numbers by 1 Pattern

In this article we will see how to print matrix in snake number pattern.

When input is like this 5*5 matrix

{{ 1, 2, 3, 4, 5 }
{ 6, 7, 8, 9, 10 }
{ 11, 12, 13, 14, 15 }
{ 16, 17, 18, 19, 20 }
{ 21, 22, 23, 24, 25 }};

Output is like

5 4 3 2 1 6 7 8 9 10 15 14 13 12 11 16 17 18 19 20 25 24 23 22 21

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Approach :

  • Enter the dimension of the matrix and store in an integer variable size.
  • Declare the n*n matrix according to the dimension.
  • Declare the value of the matrix.
  • Take a loop to traverse form top right corner form right to left horizontally .
  • For each iteration check if row value is even the traverse left to right else right to left .

Java Code to Print Matrix in Snake Number Pattern:

import java.io.*;
class Main
{
    public static void main(String[] args)
    {
        // taking the dimension of the square of the matrix as size 
        int size = 5,numberOfRows , numberOfColumns  ;
        // entering the values of n*n matrix 
        int[][] mat = {{ 1, 2, 3, 4, 5 }, { 6, 7, 8, 9, 10 },{ 11, 12, 13, 14, 15 },{ 16, 17, 18, 19, 20 }, { 21, 22, 23, 24, 25 }};
        //loop to traverse form top right corner form right to left horizontally  
         for ( numberOfRows = 0; numberOfRows < size; numberOfRows++)
         {
             // if  row value is odd then move right to left
            if (numberOfRows % 2 == 1)
            {
                for ( numberOfColumns = 0; numberOfColumns < size; numberOfColumns++)
                {
                    //printing coordinate values
                    System.out.print(Integer.toString(mat[numberOfRows][numberOfColumns]) + " ");
                }
            }
              // else then move left to right 
            else
            {
                for ( numberOfColumns = size - 1; numberOfColumns >= 0; numberOfColumns--)
                {
                     //printing coordinate values
                    System.out.print(Integer.toString(mat[numberOfRows][numberOfColumns]) + " ");
                }
            }
        }
    }
 }


Output :

5 4 3 2 1 6 7 8 9 10 15 14 13 12 11 16 17 18 19 20 25 24 23 22 21

C Code to Print Matrix in Snake Number Pattern:

#include <stdio.h>
#include <stdlib.h>
int main()
{
        int size = 5,numberOfRows , numberOfColumns  ;
        int mat[5][5] = {{ 1, 2, 3, 4, 5 }, { 6, 7, 8, 9, 10 },{ 11, 12, 13, 14, 15 },{ 16, 17, 18, 19, 20 }, { 21, 22, 23, 24, 25 }};
         for (int numberOfRows = 0; numberOfRows < size; numberOfRows++)
         {
             if (numberOfRows%2 == 1)
                for (int numberOfColumns = 0; numberOfColumns < size; numberOfColumns++)
                    printf("%d ", mat[numberOfRows][numberOfColumns]);
  
            else
                for (int numberOfColumns = size - 1; numberOfColumns >= 0; numberOfColumns--)
                    printf("%d ", mat[numberOfRows][numberOfColumns]);
         }
    return 0;
}

Output :

5 4 3 2 1 6 7 8 9 10 15 14 13 12 11 16 17 18 19 20 25 24 23 22 21

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