Simple Compiler

Deitel's simple compiler compiles simple language programs directly to simpletron instructions. The simple language is a subset of the basic language.Up wiki heirarchy; Across to computer.

Official specification. Enliterate specification. Implementations: Compiler, Postfixer, Stack, disassembler. Test facilities, example programs. (Alternative implementations: intermediate assembler, interpreter)

SIMPLE COMPILER GRAMMER:

• <A>: <D> <X> | <D> <C> <E> | <D> <F> <E> <G> <D>
• <C>: rem | input | let | print
• <D>: { 0-9 } | <D><D>
• <E>: <L> | <D> | <L> <O> <D> | <L> <O> <E>
• <G>: goto
• <F>: if
• <L>: { a-z } | <L><L>
• <O>: + | - | * | / | % | = | > | < | ==
• <X>: end

SIMPLE COMMANDS

• rem "" - commented string
• input x - value from terminal
• let x = ( 5 + 3 ) / 2 - assign via x = expression
• print 5 - print to terminal
• goto 6 - unconditional jump
• if 5 >= n goto 3 - conditional jump, form of if [ expression ] goto [ line number ]
• end - stop execution