# print_return.py
# Walker M. White (wmw2)
# August 31, 2014
"""Module do demonstrate the difference between print and return

The command print displays a value on screen, but it does not use
that value when it evaluates the function.  The command return instructs
a function call to evaluate to that value."""

def print_plus(n):
    """Prints the value of n+1 to the screen.
    
    This function does not return anything, so a function call does not
    evaluate to anything: it is a procedure.
    
    Precondition: n is a number"""
    print (n+1)


def return_plus(n):
    """Returns the value of n+1 to the screen.
    
    This function is a fruitful function and can be used in expressions.
    However, it does not necessarily display anything on screen.
    
    Precondition: n is a number"""
    return (n+1)