$($Armstrong integer$)$ Write the functions with the following headers:

$//$ Return the sum of the cubes of an integer's digits.

$//$ i$.$e$.$ cubeOfDigits$(131)$ returns $1^3+3^3+1^3=29$

int cubeOfDigits$($int number$)$

$//$ Displays if integer is an Armstrong integer

void isArmstrong$($int sum, int number$)$

Use cubeOfDigits to implement isArmstrong. An integer is an Armstrong

integer if the sum of the cubes of its digits is equal to the number itself. Write a test

program that prompts the user to enter an integer and reports whether it is an

Armstrong integer or not.