IARGC returns the number of arguments passed on the command line when the containing program was invoked.
This intrinsic routine is provided for backwards compatibility with GNU Fortran 77. In new code, programmers should consider the use of the COMMAND_ARGUMENT_COUNT — Get number of command line arguments intrinsic defined by the Fortran 2003 standard.
GNU extension
Function
RESULT = IARGC()
None
The number of command line arguments, type INTEGER(4).
GNU Fortran 77 compatibility subroutine: GETARG — Get command line arguments Fortran 2003 functions and subroutines: GET_COMMAND — Get the entire command line, GET_COMMAND_ARGUMENT — Get command line arguments, COMMAND_ARGUMENT_COUNT — Get number of command line arguments
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Licensed under the GNU Free Documentation License, Version 1.3.
https://gcc.gnu.org/onlinedocs/gcc-14.2.0/gfortran/IARGC.html