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Part 5-The FORTRAN Pre-Compiler Program
The
IBM FORTRAN
Pre-Compiler is a program that detects and permits correction
of errors in a
FORTRAN
source program before the object program is compiled.
The Pre-Compiler detects many of the more common programming errors in
individual source statements, and indicates possible logical errors in the source
program as a whole.
Two versions of the Pre-Compiler are provided, one for use with the
IBM
1621 Paper Tape Reader and
IBM
Tape Punch, and the other for the
IBM
1622
Card Read Punch. A
FORTRAN
source program which is to be processed may be
punched in paper tape or cards, or may be entered directly from the typewriter.
The operation of the Pre-Compiler can be divided into two phases: Error
Analysis and Final Program Summary.
During the error analysis phase, each statement in the
FORTRAN
program is
analyzed for an error. If an error is detected, an error code is typed, the state-
ment containing the error is typed, and the program halts so that you can type
the statement correctly. During this phase, a new
FORTRAN
source program can be
punched in paper tape or cards. After all statements have been analyzed and
corrected,
if desired, a final program summary is typed.
The final program summary phase includes information about possible
sources of errors not detectable in individual source statements.
An additional feature of the Pre-Compiler program, using the 1620 program
switches, permits you to easily alter the functions of the error analysis phase for
individual requirements. The following options are available.
1. You can suspend the halt and error correction routines, thereby providing
a quick error analysis only. These routines can be suspended for the entire
program or for individual error halts during normal processing.
2. You can enter the program through the console typewriter rather than by
card or paper tape input.
3. You can eliminate punching of an edited source program.
4. You can have correct program statements typed, in addition to the normal
operation in which only incorrect statements are typed.
The standard 1620
FORTRAN
Pre-Compiler system contains all of the functional
subroutine names included in the standard
FORTRAN
system. If you make altera-
tions to the functional names, or if you add additional subroutines to the
FORTRAN
system, you must make the corresponding alterations and additions to the Pre-
Compiler system.
Operation of the Pre-Compiler Program
Error Codes
72
Before you process any program on the Pre-Compiler, you should be familiar with
the nature of the errors that the program is deSigned to detect.
During the error analysis phase of the program, each statement is analyzed for
one or more specific errors. These errors consist of 51 of the most common errors
usually found in
FORTRAN
source programs. As an aid in evaluating these errors,
they have been grouped into seven categories:
Arithmetic statements
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