The following extensions are made for the PL0 original compiler: 1. Add the following reserved word else(elsesym), for(forsym),to(tosym),downto(downtosym),return(returnsym),[(lmparen), (rmparen). 2. Add the following operators: + = (eplus), - = (eminus), + + (dplus), - (dminus) Access operator &(radsym), pointing to operator @(padsym) 3. Modify the word: change the inequality # to < & gt; 4. Expansion statement: (1) add else clause (2) increase the for statement 5. Add operation: (1).++ operation (2). (3).+= operation (4). (5). (6). Add a multidimensional array a[i1][i2] [i3]... [I] (n - 1)/I (n - 2)] [in] (2) increase the pointer type (any variables can store a pointer, but does not support pointer to pointer, such as: b = @ @ a should be rewritten to c: = @ a, b, c) = @ 7. The procedure procedure is extended as a function: (1). The parameters (var a, var b,... .. ,var n) (2) allows the function to pass the address to the function of the function. (3) the return value is allowed; You can use a: = p (a, b, c... ., n) returns

pl0(2)
......\Debug
......\fa.tmp
......\fa1.tmp
......\fa2.tmp
......\fas.tmp
......\lxm.PL0
......\PL0.cpp
......\PL0.dsp
......\PL0.dsw
......\pl0.h
......\PL0.ncb
......\PL0.obj
......\PL0.opt
......\PL0.plg
......\PL0.sln
......\PL0.vcproj
......\PL0编译器功能扩充课程设计实验报告.doc
......\PL0编译器功能扩充课程设计实验报告YZY.doc
......\Project1.tds
......\实验报告 杨志业 3104006519
......\..............................\else.txt
......\..............................\PL0.cpp
......\..............................\pl0.h

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