program to know a matrix is identity or not

// program to know a matrix is identity or not
//to know a matrix is identity or not
#include<stdio.h>
#include<conio.h>
void main()
{
clrscr();
int a[5][5],order,i,j,first=0,second=0;
printf("enter order\n");
scanf("%d",&order);
printf("enter matrix elements\n");
for(i=0;i<order;i++)
  {
    for(j=0;j<order;j++)
      {
       scanf("%d",&a[i][j]);
      }
  }
printf("the matrix is\n");
for(i=0;i<order;i++)
  {
    for(j=0;j<order;j++)
      {
       printf("%d",a[i][j]);
      }
    printf("\n");

  }
 for(i=0;i<order;i++)
  {
    for(j=0;j<order;j++)
      {
       if(i==j)
       {
first=first+1;
}
else
{
second=second+a[i][j];
}

  }
  }

  if(first==order && second==0)
  {
  printf("it is identity matrix\n");
  }
  else
  {
  printf("it is not");
  }

  getch();
  }