Find the number of ways to divide number into four parts such that a = c and b = d | Function to find the number of ways to divide N into four parts such that a = c and b = d ; Driver code
< ? php function possibleways ( $ n ) { if ( $ n % 2 == 1 ) return 0 ; else if ( $ n % 4 == 0 ) return $ n / 4 - 1 ; else return $ n / 4 ; } $ n = 20 ; echo possibleways ( $ n ) ; ? >