# C Program to Interchange Diagonals of a Matrix

In this tutorial, i am going to show you how to interchange diagonals of a matrix in c programs.

## All C Programs to Interchange Diagonals of a Matrix

• C Program to Interchange Diagonals of a Matrix using Standard Method
• C Program to Interchange Diagonals of a Matrix using Function

### C Program to Interchange Diagonals of a Matrix using Standard Method

```/* C program to interchange Diagonals of a Matrix */

#include<stdio.h>

int main()
{
int i, j, rows, columns, arr[10][10], temp;

printf("\n Please Enter Number of rows and columns  :  ");
scanf("%d %d", &i, &j);

printf("\n Please Enter the Matrix Elements \n");
for(rows = 0; rows < i; rows++)
{
for(columns = 0;columns < j;columns++)
{
scanf("%d", &arr[rows][columns]);
}
}

if(rows == columns)
{
for(rows = 0; rows < i; rows++)
{
temp = arr[rows][rows];
arr[rows][rows] = arr[rows][i - rows - 1];
arr[rows][i - rows - 1] = temp;
}

printf("\n Matrix Elemnts after Interchanging Diagonals are: \n");
for(rows = 0; rows < j; rows++)
{
for(columns = 0; columns < i; columns++)
{
printf("%d \t ", arr[rows][columns]);
}
printf("\n");
}
}
else
{
printf("\n The Matrix that you entered is Not a Square matrix" );
}
return 0;
}```

The result of the above c program; as follows:

```Please Enter Number of rows and columns  :  3 3
1 2 3 4 5 6 7 8 9
Matrix Elemnts after Interchanging Diagonals are:
3 	 2 	 1
4 	 5 	 6
9 	 8 	 7 	 ```

### C Program to Interchange Diagonals of a Matrix using Function

```/* C program to interchange Diagonals of a Matrix */

#include<stdio.h>
void interchnage_Diagonals(int arr[10][10], int i, int j);
int main()
{
int i, j, rows, columns, arr[10][10], temp;

printf("\n Please Enter Number of rows and columns  :  ");
scanf("%d %d", &i, &j);

printf("\n Please Enter the Matrix Elements \n");
for(rows = 0; rows < i; rows++)
{
for(columns = 0;columns < j;columns++)
{
scanf("%d", &arr[rows][columns]);
}
}

if(rows == columns)
{
interchnage_Diagonals(arr, i, j);
}
else
{
printf("\n The Matrix that you entered is Not a Square matrix" );
}
return 0;
}
void interchnage_Diagonals(int arr[10][10], int i, int j)
{
int rows, columns, temp;
for(rows = 0; rows < i; rows++)
{
temp = arr[rows][rows];
arr[rows][rows] = arr[rows][i - rows - 1];
arr[rows][i - rows - 1] = temp;
}

printf("\n Matrix Elemnts after Interchanging Diagonals are: \n");
for(rows = 0; rows < j; rows++)
{
for(columns = 0; columns < i; columns++)
{
printf("%d \t ", arr[rows][columns]);
}
printf("\n");
}
}```

The result of the above c program; as follows:

```Please Enter Number of rows and columns  :  3 3