By | 18.11.2016

# Sum of main diagonal elements in a matrix

Write a C Program to find sum of main diagonal elements in a matrix. Here’s simple Program to find sum of main diagonal elements in a 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 find sum of main diagonal elements in a matrix which is successfully compiled and run on Windows System to produce desired output as shown below :

### SOURCE CODE : :

```/*  C Program to find sum of main diagonal elements in a matrix  */

#include <stdio.h>

int main()
{
int A,i,j,m,n;
int row, col, sum = 0;

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");
}

/*
* Finds the sum of main diagonal elements
*/
for(row=0; row<m; row++)
{
sum = sum + A[row][row];
}

printf("\nSum of main diagonal elements = %d\n\n", sum);

return 0;
}```

### Output : :

```/*  C Program to find sum of main diagonal elements in a matrix  */

Enter no. of rows :: 3

Enter no. of cols :: 3

Enter values to the matrix ::

Enter a value :: 2

Enter a value :: 4

Enter a value :: 6

Enter a value :: 8

Enter a value :: 0

Enter a value :: 9

Enter a value :: 7

Enter a value :: 5

Enter a value :: 3

The given matrix is ::

2       4       6

8       0       9

7       5       3

Sum of main diagonal elements = 5

Process returned 0```

Above is the source code for C Program to find sum of main diagonal elements in a matrix which is successfully compiled and run on Windows System.The Output of the program is shown above .

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Category: C Programming Matrix Programs Tags:  