C Program to Display Alternate Elements of a 2d Array

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Introduction

In this post, I am going to write a c program to display alternate elements of a 2d array. Here, 2d means two-dimensional array. We can call two-dimensional array as a matrix where rows and columns are used.

Also Read: C Program to Display Middle Row and Column of Matrix

Before writing this program, let’s see the expected output first so that you will get the idea about the program.

Expected Output of a C Program to Display Alternate Elements of a 2D Array

Enter the size of a matrix i.e. M * N
5
5
Enter elements in the 5 * 5 matrix
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
Given Matrix is
1 1 1 1 1
1 1 1 1 1
1 1 1 1 1
1 1 1 1 1
1 1 1 1 1
Alternate digits are
1   1   1
  1   1
1   1   1
  1   1
1   1   1

As you can see the above expected output, we are asking user to enter the size of the matrix. Suppose, the user has entered 5 and 5. That means, this matrix size is of 5*5 i.e. 5 rows and 5 columns. Next we are asking user to enter the elements for this matrix.

Also Read: Programs on Arrays in C

After reading elements, our program has entered the original matrix and then we will remove the alternate elements from the matrix.

See the following program.

C Program to Display Alternate Elements of a 2D Array

#include <stdio.h>
#include <stdlib.h>
int main()
{
    int a[10][10];
    int i,j,flag=0,n,m;
    printf("Enter the size of a matrix i.e. M * N\n");
    scanf("%d%d",&m,&n);
    printf("Enter elements in the %d * %d matrix\n",m,n);
    for(i=0;i<m;i++)
    {
        for(j=0;j<n;j++)
        {
            scanf("%d",&a[i][j]);
        }
    }
    printf("Given Matrix is\n");
    for(i=0;i<m;i++)
    {
        for(j=0;j<n;j++)
        {
            printf("%d ",a[i][j]);
        }
        printf("\n");
    }
    printf("Alternate digits are\n");
    for(i=0;i<m;i++)
    {
        for(j=0;j<n;j++)
        {
            if(flag==0)
            {
                printf("%d ",a[i][j]);
                flag=1;
            }
            else
            {
                printf("  ");
                flag=0;
            }
        }
        printf("\n");
    }
    return 0;
}

Explanation

The above c program is displaying the alternate elements in a 2d array. Here, with the flag variable, we are displaying the alternate digits or elements. When the value of flag=0, then we print the element and make the value of flag=1. In the next run, when the value of flag=1, then will print the blank space instead of element and again make the value of flag=0. This process will continue until we reach the end of the matrix.

I hope you have understood this program. If you have any difficulties, please feel free to contact me.

Thank you.

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  5. Insert and Delete element in Array in C using switch case

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