PL/0 is a programming language that was invented for educational purposes. It is a relatively simple language that's used as a gateway into the world of compilers. There's also a lot to be discussed when it comees to the essence of how programming languages are written and understood by computers.
Use the following productions in order to write any program in PL/0
program ::= block "." .
block ::= const-declaration var-declaration procedure-declaration statement.
constdeclaration ::= ["const" ident "=" number {"," ident "=" number} ";"].
var-declaration ::= [ "var "ident {"," ident} “;"].
procedure-declaration ::= { "procedure" ident ";" block ";" }
statement ::= [ ident ":=" expression
| "call" ident
| "begin" statement { ";" statement } "end"
| "if" condition "then" statement ["else" statement]
| "while" condition "do" statement
| "read" ident
| "write" expression
| e ] .
condition ::= "odd" expression
| expression rel-op expression.
rel-op ::= "="|“!="|"<"|"<="|">"|">=“.
expression ::= [ "+"|"-"] term { ("+"|"-") term}.
term ::= factor {("*"|"/") factor}.
factor ::= ident | number | "(" expression ")“.
number ::= digit {digit}.
ident ::= letter {letter | digit}.
digit ::= "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9“.
letter ::= "a" | "b" | … | "y" | "z" | "A" | "B" | ... | "Y" | "Z".
My program takes in a program written in Pl/0 in a .txt document as an arguement. It will then run it through a lexical analyzer, parser, and virtual machine (all written in C) and produce an output based on the program that was passed in.
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