Print nodes at a given level
void printGivenLevel ( Node node , int level ) { if ( node == null ) return ; if ( level == 1 ) System . out . print ( node . data + " ▁ " ) ; else if ( level > 1 ) { printGivenLevel ( node . left , level - 1 ) ; printGivenLevel ( node . right , level - 1 ) ; } }