Driver code
public static void main ( String [ ] args ) { int num = 55 ; if ( isTriangular ( num ) ) System . out . println ( " The ▁ number ▁ is " + " ▁ a ▁ triangular ▁ number " ) ; else System . out . println ( " The ▁ number ▁ " + " is ▁ NOT ▁ a ▁ triangular ▁ number " ) ; } }