To find numerator in fraction form of given number . For example , for 30.25 , numerator would be 3025.
int num = 0 ; for ( int i = 0 ; i < n ; i ++ ) { if ( str [ i ] != ' . ' ) { num = num * 10 + ( str [ i ] - '0' ) ; if ( dot_seen == true ) count_after_dot ++ ; } else dot_seen = true ; }