Subroutines: 2

Abstract

The aims of this chapter are to extend the ideas in the earlier chapter on subroutines by using concrete examples that:

• look at passing rank one arrays as parameters, rather than simple scalars;

  • to introduce explicit shape dummy arrays;

• look at passing character variables as parameters;

  • to introduce assumed length dummy arguments;

• uses the Quick Sort algorithm which in turn;

  • introduces recursive subroutines;

  • introduces the use of an internal subroutine;

  • looks at the way in which we can maintain a consistent interface between a program and a subroutine and actually re-implement the algorithm that solves the particular sub-problem;

  • looks at the use of the timing routines available in Fortran to determine where the program actually spends its time;

• look at passing rank two arrays as parameters;

  • to introduce assumed shape dummy arrays;

It is one thing to show a man he is in error, and another to put him possession of the truth.

John Locke