C++ beginning

Problem 3. Using some predefined functions. Write a program to accept a user input as a number and perform one of the options selected from the following menu. Your program will have this menu.

1. Round up my number

2. Round down my number

3. Show the absolute value of my number

Call your program convert_1.cpp.

Problem 4. Write a program to calculate the area and perimeter of a pentagon. User should enter the required input. The area and the perimeter are displayed on the screen. You must use function called AREA and perimeter with appropriate argument(s). The output should be printed from within the main program. Your function does not return anything.