COMTRAN Reconstruction

F28-8043 · June 1960

Page 60

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[page 60]

Relationship Between Program Commands and Processor Commands

It will be obvious to the reader at this point that the program commands and the processor commands are essentially quite different. Accordingly, they cannot be intermixed in source program sentences. For example, it is meaningless to write sentences such as:

IF A = B THEN GO TO C OTHERWISE OVERLAP SECTION.1,
     SECTION.2.

Processor commands, with the exception of BEGIN SECTION and END, should be written as unnamed sentences. This rule makes it impossible for a program command to transfer control to a processor command. (In a sense, BEGIN SECTION and END are not exceptions to the rule since their main purpose is to permit the programmer to apply a name to two or more sentences of procedure.) This is not to say, however, that the two types of commands cannot appear in sequence in a source program. It is perfectly logical, for example, to use INCLUDE HERE following a program command as long as the preceding sentence logically leads to the first sentence of the procedure being included.