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Check if a given matrix is an identity matrix

/* 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][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");
}

/*------------------------------------------
Output
Run 1
Enter the order of the matrix A
2 2
Enter the elements of matrix A
2 2
1 2
MATRIX A is
2 2
1 2
It is not a identity matrix

Run 2
Enter the order of the matrix A
2 2
Enter the elements of matrix A
1 0
0 1
MATRIX A is
1 0
0 1
It is identity matrix
------------------------------------------*/