Question

I need to reverse Hello. using recursion so that the end result does not have a .

My current method is:

public void foo(){
    Scanner scan = new Scanner(system.in);
    char c = scan.nextChar();
    if (c!='.')
        foo();
    System.out.print(c);
}

This seems to output the reverse, however it still has the .. Can someone point me in the right direction to get rid of the period?

Answer 1

Use '.' instead of "." since you are comparing a char, not a String:

public void foo(){
  Scanner scan = new Scanner(system.in);
  char c = scan.nextChar();
  if (c != '.') {
    foo();
    System.out.print(c);
  }
}

Also note that if it were a String, you’d need to use equals to do the comparison. == or != is used to compare primitive types, such as char.