#include <stdio.h>
void main()
{
int A[10][10];
int i, j, R, C, flag =1;
printf("Enter the order of the matrix A\n");
scanf("%d %d", &R, &C);
printf("Enter the elements of matrix A\n");
for(i=0; i<R; i++)
{
for(j=0; j<C; j++)
{
scanf("%d",&A[i][j]);
}
}
printf("MATRIX A is\n");
for(i=0; i<R; i++)
{
for(j=0; j<C; j++)
{
printf("%3d",A[i][j]);
}
printf("\n");
}
for(i=0; i<R; i++)
{
for(j=0; j<C; j++)
{
if(A[i][j] != 1 && A[j][i] !=0)
{
flag = 0;
break;
}
}
}
if(flag == 1 )
printf("It is identity matrix\n");
else
printf("It is not a identity matrix\n");
}
Identity matrix is a square matrix with ones on the main diagonal of matrix and zeros elsewhere. An identity matrix is denoted I and an Identity matrix of size n is a n x n square matrix and is denoted by In.
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