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Program in C to transpose a 2D array

Transpose means changing the rows of 2D array into columns and columns into rows. Below is the code in the C programming language to transpose a two dimensional array –

/* C program to transpose the 2D array */

#include<stdio.h>

void main()
{
     int a[10][10], b[10][10], m, n, i, j;
     
     printf("\nEnter number of rows & columns of aray : ");
     scanf("%d %d", &m, &n);
     
     printf("\nEnter elements of 2-D array:\n");
     for(i=0; i<m; i++)
     {
              for(j=0; j<n; j++)
              {
                       scanf("%d", &a[i][j]);
              }
     }
     
     printf("\n\n2-D array before transposing:\n\n");
     for(i=0; i<m; i++)
     {
              for(j=0; j<n; j++)
              {
                       printf("\t%d", a[i][j]);
              }
              printf("\n\n");
     }
     
     /* Transposing array */
     for(i=0; i<m; i++)
     {
              for(j=0; j<n; j++)
              {
                       b[j][i] = a[i][j];
              }
     }
     
     printf("\n\n2-D array after transposing:\n\n");
     for(i=0; i<n; i++)
     {
              for(j=0; j<m; j++)
              {
                       printf("\t%d", b[i][j]);
              }
              printf("\n\n");
     }
     getch();
}

We create the 2D array first and after that it’s transpose is done which is stored in new 2D array. Hence the result is printed.
Input- 
Enter number of rows & columns of aray : 3 x 3
Enter elements of 2-D array:
25   12   4   62   34   23   6   4   3

Output-
2-D array before transposing:

25   12  4

62   34  23

6     4     3

2-D array after transposing:

25   62   6

12   34   4

4    23    3

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9 thoughts on “Program in C to transpose a 2D array

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