Start by implementing a helper method named pad(). This method takes two argumen

Question

Start by implementing a helper method named pad(). This method takes two arguments: a String representing a binary value (i.e., it only contains the characters T and ‘0') and a non-negative integer represe the String argument is less than the integer argument, the method prepends additional ‘0' characters to the beginning of the string until it reaches the desired length, and then returns the modified string. If the String argument is already at (or longer than) the desired length, the method just returns the original String. nting the desired length. If the length of For example, pad("110", 5) will return "00110", while pad ( “101101", 3) will return "101101" (because "101101" already has a length greater than or equal to 3).

Explanation / Answer

class Main{
  
public static String pad(String str,int len){
//create an empty string.
String newStr = "";
// add zeros to the starting of the string untill less than string length.
for(int i=str.length();i<len;i++){
newStr = newStr + "0";
}
//add str to newStr
newStr = newStr + str;
return newStr;
}
  
public static void main(String args[]){
System.out.println(pad("110",5));
System.out.println(pad("10110",3));
}
  
}

/*
sample output

00110
10110
*/

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