ABSTRACT
The programs of §1 and §2 are examples of straight-line code, in which the executable statements are performed exactly once, in order from first to last. If we think of each FORTRAN statement as being in control of the processor for the duration of its execution, then the progress of execution from one statement to the next can be regarded as a flow of control through the program. In straight-line programs, the flow of control is strictly from top to bottom.
