C Program to Check whether a given Matrix is an Identity Matrix

Program:

#include<stdio.h>
main()
{
 int i,j,rows,col,flag=1;
 printf("Enter number of rows and columns of a matrix\n");
 scanf("%d %d",&rows,&col);
int a[rows][col];
 if(rows==col)
 {
  //Taking input of matrix
    printf("Enter Matrix :\n");
    for(i=0;i<rows;i++)
    {
       for(j=0;j<col;j++)
      {
     scanf("%d",&a[i][j]);
      }
    }
 
    printf("Given /matrix is\n");
        for(i=0;i<rows;i++)
         {
         for(j=0;j<col;j++)
         {
           printf("%d\t",a[i][j]);
           }
 
           printf("\n");
           }
 
        for(i=0;i<rows;i++)
        {
         for(j=0;j<col;j++)
         {
          if(i==j &&a[i][j]!=1)
          {
           flag=0;
          }
          if(i!=j && a[i][j]!=0)
          {
           flag=0;
          }
         }
        }
      if(flag==1)
      {
       printf("It is an Identity Matrix\n");
      }
      else
      {
       printf("It is not an Identity Matrix\n");
      }
 }
 
 else
 {
  printf("Identity matrix should be a Square matrix \n");
 }
}

Output: