By | 18.11.2016

# Swap diagonals elements of a matrix

Write a C program to Swap diagonals elements of a matrix. Here’s simple Program to interchange elements of primary and secondary diagonals of matrix in C Programming Language.

## What is Matrix ?

Matrix representation is a method used by a computer language to store matrices of more than one dimension in memory. C uses “Row Major”, which stores all the elements for a given row contiguously in memory.

Two-dimensional Arrays : :

The simplest form of multidimensional array is the two-dimensional array. A two-dimensional array is, in essence, a list of one-dimensional arrays. An m × n (read as m by n) order matrix is a set of numbers arranged in m rows and n columns.

To declare a two-dimensional integer array of size [x][y], you would write something as follows −

• type arrayName [ x ][ y ];

Where type can be any valid C data type and arrayName will be a valid C identifier.

Below is the source code for C program to Swap diagonals elements of a matrix which is successfully compiled and run on Windows System to produce desired output as shown below :

### SOURCE CODE : :

```/*  C program to Swap diagonals elements of a matrix  */

#include <stdio.h>

int main()
{
int A,i,j,m,n;
int row, col, square, temp;

printf("Enter no. of rows :: ");
scanf("%d", &m);
printf("\nEnter no. of cols :: ");
scanf("%d",&n);
printf("\nEnter values to the matrix :: \n");
for (i = 0; i < m; i++)
{
for (j = 0; j < n; j++)
{
printf("\nEnter a[%d][%d] value :: ",i,j);
scanf("%d", &A[i][j]);
}
}

printf("\nThe given matrix is :: \n\n");

for (i = 0; i < m; ++i)
{
for (j = 0; j < n; ++j)
{
printf("\t%d", A[i][j]);
}
printf("\n\n");
}

square = (m < n) ? m : n;

/*
* Interchanges diagonal of the matrix
*/
for(row=0; row < square; row++)
{
col = row;

temp = A[row][col];
A[row][col] = A[row][(square - col)-1];
A[row][(square - col)-1] = temp;
}

/*
* Prints the interchanged diagonals matrix
*/
printf("\nMatrix after diagonals interchanged: \n");
for (i = 0; i < m; ++i)
{
for (j = 0; j < n; ++j)
{
printf("\t%d", A[i][j]);
}
printf("\n\n");
}

return 0;
}```

### Output : :

```/*  C program to Swap diagonals elements of a matrix  */

Enter no. of rows :: 3

Enter no. of cols :: 3

Enter values to the matrix ::

Enter a value :: 1

Enter a value :: 2

Enter a value :: 3

Enter a value :: 4

Enter a value :: 5

Enter a value :: 6

Enter a value :: 7

Enter a value :: 8

Enter a value :: 9

The given matrix is ::

1       2       3

4       5       6

7       8       9

Matrix after diagonals interchanged:
3       2       1

4       5       6

9       8       7

Process returned 0```

Above is the source code for C program to Swap diagonals elements of a matrix which is successfully compiled and run on Windows System.The Output of the program is shown above .

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