1. Why must getline() be used insteadof cin to get string input?
   2. Give an example of when you would need touse cin.ignore() in your code
   3. Strings in C++ are mutable, this is different than in Javawhere strings were immutable. What do we mean by mutableversus immutable?
   4. Imagine your code had the following string variable init string message ="HH231JJ"; Write a for loop that uses the [ ]operator to change each 'H' character in the message string toa '#' character.