4.1 Exercise 4.7 in the textbook.
4.2 Exercise 4.11 in the textbook.
4.3 Exercise 4.21 in the textbook.
4.4 Write a program that takes in a file containing a C++ program and outputs the uncommented part of the program to another file (all you need to do is check for comments, you don't need to check whether the input file is a valid C++ program).
4.5 Write a boolean function that takes in an array a and an integer size (the size of the array) and returns true if the values in the array are exactly the values 1..size.
(Extra Credit) Write a function that sorts an array using the quicksort algorithm. (If you don't know what the quicksort algorithm is, find out from the Web or from a textbook on algorithms)