Suppose we are given the task of generating code to multiply integer variable x by various different constant
factors K. To be efficient, we want to use only the operations +, -, and <<. For the following values of K, write C expressions to perform the multiplication using at most three operations per expression.
(a) K = 18: (b) K = 7: (c) K = 65: (d) K = -48:
Please properly document the code and the functions of lines