Anonymous

bool isMyStringANumber(String s){
  for(int i=0; i<s.length(); ++i){
    c = s.charAt(i);
    if(!(c<= '9' && c >= '0')){ // how should I have written this line?
      // what goes here?
    }
  }
  //what goes here?
}

// something else is missing - what is it?