def cube(x):
    '''Return the cube of x.
    '''
    
    return x * x * x

def print_cube(x):
    '''Print the cube of x.
    '''
    
    print x * x * x
    
if __name__ == "__main__":
    print "Testing cube()"
    x_cubed = cube(3)
    print "The cube of 3 is", x_cubed
    
    print "Testing print_cube()"
    x_cubed = print_cube(3)
    print "The cube of 3 is", x_cubed