public class Srv {


    //Returns string w/ int number of spaces before the string
    public String leftPad(String s, int num){
        String result = "";


        for(int i = 0; i < num; i++){
            result += " ";
        }

        //result += s;

        return result + s;

    }


    //answers whether or not char given is a digit
    public boolean isDigit(char ch){
        boolean result = false;
        if(ch>='0' && ch<='9')
            result=true;

        return result;
    }

    //takes in string and counts # of digits in string; assume isDigit works
    public int countDigits(String str){
       int count = 0;
       for(int i = 0; i<str.length(); i++){
           if(isDigit(str.charAt(i))) {
               count++;
           }
       }

       return count;
    }

    //answers if every char in String is digit
    public boolean allDigits(String str){
        boolean result = true; //PROVE IT WRONG, don't try to prove it correct
        for(int i = 0; i<str.length(); i++){
            if(!isDigit(str.charAt(i)))
                result = false;
        }
        return result;
        //one line solution!!!
        //return countDigits(str) == str.length();


    }


}