# f77rtl

Tells the compiler to use the run-time behavior of FORTRAN 77.

## Syntax

Linux: | -f77rtl -nof77rtl

macOS: | -f77rtl -nof77rtl

Windows: | /f77rtl /nof77rtl

## Arguments

None

## Default

nof77rtl | The compiler uses the run-time behavior of Intel® Fortran.

## Description

This option tells the compiler to use the run-time behavior of FORTRAN 77.

Specifying this option controls the following run-time behavior:

- When the unit is not connected to a file, some INQUIRE specifiers will return different values:

  - NUMBER= returns 0

  - ACCESS= returns 'UNKNOWN'

  - BLANK= returns 'UNKNOWN'

  - FORM= returns 'UNKNOWN'

- There is no support for the PAD= qualifier. FORTRAN 77 does not pad formatted input.

- NAMELIST and list-directed input of character strings must be delimited by apostrophes or quotes.

- When processing NAMELIST input:

  - Column 1 of each record is skipped.

  - The '$' or '&' that appears prior to the group-name must appear in column 2 of the input record.

## IDE Equivalent

Visual Studio: Compatibility > Enable F77 Run-Time Compatibility

## Alternate Options

None

Parent topic: Compatibility Options