Write a $C++$ function named whole$()$ that returns the integer part of any number passed to the function. $($Hint: Assign the passed argument to an integer variable.$)$ Include the function written in a working program. Make sure your function is called from main$()$ and correctly returns a value to main$().$ Have main$()$ use a cout statement to display the returned value. Test the function by passing three data to it $($integer$,$ double, negative$).$ When you're confident that the whole$()$ function written for works correctly, save it in a namespace and a personal library of your choice in the C: drive. Submit code with three sample runs plus cpp and namespace files.