Question: Simple example of a Function

Using Fortran 90

Write a main program and an internal function that takes two REAL arguments and returns the second argument subtracted from the first. Keep the code as simple as possible. Test this by including calls to add the following pairs of numbers: 1.23 4.56 -7.89 3.42 4.29 -0.98 1.2 Add INTENT and ELEMENTAL to the above code and check that it works. 1.3 Change the call to using keywords and reverse the order of the arguments; check that this does not change the results.