Sheltran - Limitations

Limitations.

• The maximum number of procedure sections in a program unit is 99.

• The following variable names are reserved by SHELTRAN and must not be used: IF, ELSEIF, WHILE, UNTIL, FOR; all 6-character variable names beginning with 'IZZZ'

• It is not allowed to give variable names beginning with 'I' an implicit type other than INTEGER.

• PERFORM statements in FOR-loops cause non-standard FORTRAN to be generated. This is because after a procedure section has been executed, a jump into the generated DO-loop is necessary to resume execution after the PERFORM statement. Most compilers however allow this kind of jump which was part of the previous FORTRAN standard (FORTRAN IV).