C++Q2 : Write a program that prompts the user to enter two numbers (n1 and n2) then swap them. Your program must have the following function: a. Swap: This function takes the reference parameters of n1 and n2 and swap their values.

predefined functions, write each of the following 1-Using C++ C++ expression. as 2b+4a 1-b+ + 2b 2- b + (x + 21 3- b = x + ant -b+b7-4ac 4- X = 2ab