HP 3000 Manuals HP 3000 Manuals
Use of COMMON and Labels Non-FORTRAN program units cannot access a FORTRAN COMMON area and FORTRAN program units cannot access the global variables of non-FORTRAN programs. All data must be passed through the parameter lists. If a FORTRAN program calls a non-FORTRAN program unit, the FORTRAN program can contain COMMON areas, but the non-FORTRAN unit cannot use global variables. If a non-FORTRAN program calls a FORTRAN subprogram, the program can use global variables and the FORTRAN routine can use COMMON variables. The global variables and COMMON variables occupy distinct areas of memory. Labels cannot be used as parameters when calling non-FORTRAN program units.