Description: 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
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