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HP Fortran 90 Programmer's Reference: HP Series 700/800 Computers > Chapter 2 Language elements

Program structure

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A complete executable program contains one main program unit and zero or more other program units, where each of these can be compiled separately.

A program unit is one of the following:

  • Main program unit

  • External function subprogram unit

  • External subroutine subprogram unit

  • Block data program unit

  • Module program unit

Execution of the program starts in the main program and then control can be passed between the main program and the other program units.

The Fortran 90 program units, and the transfer of control between them, are described in Chapter 7.

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