Lab 12  Introduction to Functions

Task 1, Developing Simple Functions:

1. Define a function called power_of_two that has no parameters. When called it should use a loop to print 2 to the first power, 2 to the second power... up to 2 to the fifth power -- one per line.
2. Now you would like to make your function more general. Define a function called power5 that has one parameter, say x. When called, it should use a loop to print x to the first power, x to the second power ... up to x to the fifth power -- one per line.
3. Write a program that prompts the user for x and prints x to the 5th power, by using your function.

Task 2,  Functions that Return Values:

In general functions return values (the last two did not).  

1. Now define a function called power that has two parameters, x and n. The function should return (not print) the result of raising x to the n-th power. Do this with a loop. In other words, to compute x to the fourth, you would start with an accumulator = 1 and then multiply by x four times.  This is what has to be done in a language that does not have an operator for exponentiation.  Start by assuming that n is a positive integer.  
2. Write a main program that prompts the user for x and n and prints x to the nth power, by using your function.
3. When you have that working, make sure you handle the case that n is 0 (any non-zero number raised to the zero power gives 1).   You may assume n  is a nonnegative integer (not too large!).