use include iostream

The While and if statements 1. Write an if statement that adds 3 to n when n is positive and smaller than 20 2. Write an if statement that adds 1 to n when n is negative; otherwise it subtracts 1 from n. 3. Write a while statement that adds 5 to n so long as n is positive or zero. a. What will be the value of n afterwards if n is originally -27? b. What will be the value of n afterwards if n is originally 125? 4. Consider the following loop While(n !=0) { If (n