Determining the main routine

In Language Environment, only one routine can be the main routine. The main routine should be presented to the linkage editor first.

A Fortran routine is designated as a main routine with a PROGRAM statement, which indicates the name of the main routine. A Fortran routine can also be designated as a main routine in the absence of the PROGRAM, SUBROUTINE, and FUNCTION statements, in which case the name of the main routine has a default value of MAIN (or MAIN# for VS FORTRAN Version 2 Releases 5 and 6).

A PL/I routine is designated as a main routine with the OPTIONS(MAIN) option on the PROCEDURE statement.

An entry point is defined for each supported HLL. Table 1 identifies the desired entry point. The table assumes that your code was compiled using the Language Environment-conforming compilers.

Table 1. Determining the entry point
HLL	Main entry point	Fetched entry point
Fortran	Name on the PROGRAM statement or `MAIN` (or `MAIN#` for VS FORTRAN Version 2 Releases 5 and 6).	Name on a SUBROUTINE or FUNCTION statement
PL/I	CEESTART	CEESTART or routine name, if OPTIONS(FETCHABLE) is used.