Write a REAL function in Fortran to calculate the gravitational force $f$ between

two bodies of masses $m_1$ and $m_2.$ The formula gives the force due to gravity:

$f=G{m}_1\frac{m_2}{r^2}$

Where:

$G$ is the gravitational constant, $G=6\mathrm{.}673{10}^{-11}($in $\frac{m^3}{k}g*s^2\frac{m^3}{k}g*s^2),$

$r$ is the distance $($in meters$)$ between the two bodies,

$m_1$ and $m_2$ are the masses of the two bodies $($in kilograms$).$

You should define $G$ as a parameter in your program.

Additionally, develop a main program that prompts the user to input the masses

of the two bodies and the distance between them. Your main program should call

the function to calculate the gravitational force $f$ and print the result.