Oct 3, 2011

C Program to check if a given matrix is an identity matrix

C Program to check if a given matrix is an identity matrix or not. If I is theIdentity Matrix,then for any matrix A, IA=AI=A. Program will check the givan matrix is identity or not, and prints the appropriate message. Read more about C Programming Language .
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/* C Program  Write a C Program to check if a given matrix is an identity matrix */
#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");
 }

 /* Check for unit (or identity) matrix */

 for(i=0; i<R; i++)
 {
  for(j=0; j<C; j++)
  {
    if((A[i][i] != 1) || (( i != j) && (A[i][j] != 0)))
   {
    flag = 0;
    break;
   }
  }
 }

 if(flag == 1 )
  printf("It is identity matrix\n");
 else
  printf("It is not a identity matrix\n");
}
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