Print diagonal elements of a Matrix

Write a C Program to print diagonal elements of a Matrix. Here’s simple Program to print diagonal elements of 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 print diagonal 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 print diagonal elements of a Matrix  */

#include<stdio.h>

int main()
{
    int array1[10][10],i,j,m,n,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", &array1[i][j]);
        }
    }

    printf("\nThe Diagonals elements of a matrix are :: \n\n");

    /*check condition to print diagonals, matrix must be square matrix*/
    if(m==n)
    {
            /*print diagonals*/
            for(i=0;i<m;i++)
            {
                for(j=0;j<n;j++)
                {

                    if(i==j)
                        printf("\t%d", array1[i][j]);    /*print elements*/
                    else
                        printf("\t");   /*print space*/
                }
                printf("\n\n");   /*after each row print new line*/
            }
    }
    else
    {
        printf("\nMatrix is not a Square Matrix.");
    }

    return 0;
}

Output : :

/*  C Program to print diagonal elements of a Matrix  */

Enter no. of rows :: 3

Enter no. of cols :: 3

Enter values to the matrix ::

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

Enter a[0][1] value :: 2

Enter a[0][2] value :: 3

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

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

Enter a[1][2] value :: 6

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

Enter a[2][1] value :: 8

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

The Diagonals elements of a matrix are ::

        1

                5

                        9

Process returned 0

Above is the source code for C Program to print diagonal 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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