The gravitational attraction of the earth on an object is proportional to
the inverse square of the distance between the center of the earth and the
center of the object. Write a program that determines the relative weight
of an object at two distances. Write and use a function name square
in your solution. Use your program to determine how much more an object
weighs at sea level than at the top of Mount Everest. Also use your
program to determine how much more an object is attracted to the center of
the earth at sea level than it would be if it were at the same distance
from the center as is the earth's moon.