Assignment

#include <stdio.h>
int main()
{
    int i,j,n,flag=0;
    printf("enter no of rows:");
    scanf("%d",&n);
    int a[n][n];
    printf("enter matrix");
    for (i=0;i<n;i++)
    {
        for (j=0;j<n;j++)
            {
                scanf("%d",&a[i][j]);
            }
    }
    for (i=0;i<n;i++)
    {
        for (j=0;j<n;j++)
                {
                if (i-j==0 && a[i][j]==1)
                flag++;
                else
                    printf("it is not identity");
                    break;
                }

    }
    if(flag==n)
        printf("entered matrix is identity\n");
}