Write a program that meets the following requirements: - Contains two methods - The first method ask the user to enter one number and stores the number in the respective global variable. Call this...

Write a program that meets the following requirements:

- Contains two methods
- The first method ask the user to enter one number and stores
the number in the respective global variable. Call this method

userInput. Usefloatordoublefor the variable.
- The second method will use the global variable, cube the value,
and display he result to the screen. Call this methodcube.

- Use modular design (use functions)

- Use proper documentation and C++ writing style

- Use only techniques and libraries use in this course and book