2. Write a C++ program that does the following: a. Create a C++ file with the name problem2.cpp. b. Prompt the user to enter a positive integer n, validating the input until the user enters a positive integer. c. Print the sequence of numbers from 1 to n but print negative values for even numbers. Sample run of the program: Enter a positive integer: -4 Invalid input! Enter a positive integer: 7 1-23-45-67.