.sp 2 .NH Comparison with the Pascal-VU compiler .nh .LP In this chapter, the differences with the Pascal-VU compiler [IM2] are listed. The points enumerated below can be used as improvements to the compiler (see also Chapter 11). .sp .NH 2 Deviations .LP .sp - large labels .in +3m only labels in the closed interval 0..9999 are allowed, as opposed to the Pascal-VU compiler. The Pascal-VU compiler allows every unsigned integer as label. .in -3m - goto .in +3m the new compiler conforms to the standard as opposed to the old one. The following program, which contains an illegal jump to label 1, is accepted by the Pascal-VU compiler. .nf \fBprogram\fR illegal_goto(output); \fBlabel\fR 1; \fBvar\fR i : integer; \fBbegin\fR \fBgoto\fR 1; \fBfor\fR i := 1 \fBto\fR 10 \fBdo\fR \fBbegin\fR 1 : writeln(i); \fBend\fR; \fBend\fR. .fi This program is rejected by the new compiler. .in -3m .NH 2 Extensions .LP .sp The extensions implemented by the Pascal-VU compiler are listed in Chapter 5 of [IM2]. .sp - separate compilation .ti +3m the new compiler only accepts programs, not modules. - assertions .ti +3m not implemented. - additional procedures .ti +3m the procedures \fIhalt, mark\fR and \fIrelease\fR are not available. .bp - UNIX\(tm interfacing .ti +3m the \-c option is not implemented. .FS \(tm UNIX is a Trademark of Bell Laboratories. .FE - double length integers .ti +3m integer size can be set with the \-V option, so the additional type \fIlong\fR is not implemented. .NH 2 Compiler options .LP .sp The options implemented by the Pascal-VU compiler are listed in Chapter 7 of [IM2]. .sp The construction "{$....}" is not recognized. The options: \fIa, c, d, s\fR and \fIt\fR are not available. The \-l option has been changed into the \-L option. The size of reals can be set with the \-V option.