Recursion Assignment 2 StringToInteger

Asg2.StringToInteger.java

/*
Write a recursive function to convert a given string into the number it represents. That is input will be a numeric string that contains only numbers, you need to convert the string into corresponding integer and return the answer.
Input format : Numeric string (string, Eg. "1234")
Output format : Corresponding integer (int, Eg. 1234)
*/
public static int convertStringToInt(String input){
	if(input.length()<1)
	{
		return 0;
	}
	return input.charAt(input.length()-1)-'0'+(10*convertStringToInt(input.substring(0,input.length()-1)));
	
}

/*
Working
3+10*
     2+10*
         1+10*
              0    //fall back of recursive calls
         1+10*0    =1
     2+10*1        =12
3+10*12            =123
*/