C # program to check if a given matrix is identity
using System ; class GFG { int MAX = 100 ; static bool isIdentity ( int [ , ] mat , int N ) { for ( int row = 0 ; row < N ; row ++ ) { for ( int col = 0 ; col < N ; col ++ ) { if ( row == col && mat [ row , col ] != 1 ) return false ; else if ( row != col && mat [ row , col ] != 0 ) return false ; } } return true ; }