| programm | block "." . |
| block |
["CONST" ident "=" number{","
ident "=" number}";"] ["VAR" ident{"," ident} ";"] {"PROCEDURE" ident ";" block ";"} statement. |
| statement |
[ident ":=" expression | "CALL" ident | "?" ident | "!" expression | "BEGIN" statement {";" statement} "END" | "IF" condition "THEN" statement | "WHILE" condition "DO" statement]. |
| condition |
"ODD" expression | expression ("=" | "#" | "<" | "<=" | ">" | ">=") expression. |
| expression |
["+" | "-"] term {("+" | "-")
term}. |
| term |
factor {("*" | "/") factor } . |
| factor |
ident | number | "(" expression
")". |