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

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[10][10],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[0][0] value :: 2

Enter a[0][1] value :: 4

Enter a[0][2] value :: 6

Enter a[1][0] value :: 8

Enter a[1][1] value :: 0

Enter a[1][2] value :: 9

Enter a[2][0] value :: 7

Enter a[2][1] value :: 5

Enter a[2][2] 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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About Tunde A

My name is Tunde Ajetomobi, a Tech Enthusiast and Growth Hacker. I enjoy creating helpful content that solves problem across different topics. Codezclub is my way of helping young aspiring programmers and students to hone their skills and find solutions on fundamental programming languages.

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