# C program to check whether a Matrix is Identity Matrix or not

*Check whether a matrix is Identity matrix*

*Check whether a matrix is Identity matrix*

Write a C program to check whether a Matrix is Identity Matrix or not. Here’s simple Program to check whether a matrix is unit matrix or not 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 check whether a Matrix is Identity Matrix or not which is successfully compiled and run on Windows System to produce desired output as shown below :

**SOURCE CODE : :**

**SOURCE CODE : :**

/* C program to check whether a Matrix is Identity Matrix or not */ #include <stdio.h> int main() { int A[10][10],B[10][10],i,j,m,n; int row, col, isIdentity; 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]); } } /* * Checks whether it is Identity matrix or not */ isIdentity = 1; for(row=0; row<m; row++) { for(col=0; col<n; col++) { if(row==col && A[row][col]!=1) { /* If elements of main diagonal is not equal to 1 */ isIdentity = 0; } else if(row!=col && A[row][col]!=0) { /* If other elements than main diagonal is not equal to 0 */ isIdentity = 0; } } } /* * If it is an Identity matrix */ if(isIdentity==1) { printf("\nThe given matrix is an Identity Matrix.\n"); /* * Prints the Identity matrix */ for (i = 0; i < m; ++i) { for (j = 0; j < n; ++j) { printf("\t%d", A[i][j]); } printf("\n\n"); } } else { printf("The given matrix is not Identity Matrix"); } return 0; }

*Output : :*

*Output : :*

/* C program to check whether a Matrix is Identity Matrix or not */ 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 :: 0 Enter a[0][2] value :: 0 Enter a[1][0] value :: 0 Enter a[1][1] value :: 1 Enter a[1][2] value :: 0 Enter a[2][0] value :: 0 Enter a[2][1] value :: 0 Enter a[2][2] value :: 1 The given matrix is an Identity Matrix. 1 0 0 0 1 0 0 0 1 Process returned 0

Above is the source code for C program to check whether a Matrix is Identity Matrix or not which is successfully compiled and run on Windows System.The Output of the program is shown above .

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