text: Function to count number of special two digit number
code: void countSpecialDigit ( struct Node * rt , int * c ) { int x ; if ( rt == NULL ) return ; else { x = check ( rt -> info ) ; if ( x == 1 ) * c = * c + 1 ; countSpecialDigit ( rt -> left , c ) ; countSpecialDigit ( rt -> right , c ) ; } }