def.y ->def.tab.c , def.tab.h
def.yy->def.tab.cc, def.tab.hh

Makefile:
def.y   def.tab.c ,
  |         |
  V         V
def.yy  def.tab.cc,
nowa zmienna: CPP=g++
CC -> CPP w dwóch miejscach:
  kompilacja def.tab.cc
  kompilacja całości 
  
def.yy:
extern "C" int yylex();
extern "C" int yyerror(const char *msg, ...);
using namespace std;

zx.l:
int yyerror(const char *msg, ...);
int yyerror(const char *msg, ...){




kod:
int a;//=26
int b = 2;
int c = 3;
int foo = 4;
a = b + 7 * foo - (c+5)/2;

strumień wyjściowy ONP:
a  b  7 foo * + c 5 + 2 / - = 

'1*' -> w1* = 7   *   foo
'1+' -> w1+ = b   +   w1*
'2+' -> w2+ = c   +   5
'1/' -> w1/ = w2+ /   2
'1-' -> w1- = w1+ -   w1/
'1=' -> w1= = a   =   w1-

'1*' -> t1 = 7   *   foo
'1+' -> t2 = b   +   t1
'2+' -> t3 = c   +   5
'1/' -> t4 = t3  /   2
'1-' -> t5 = t2  -   t4
'1=' -> t6 = a   =   t5

'1*' -> t1 = 7   *   foo
MOV R1,7      #   MOV R1, 7
MOV R2,#3     # MOV R2, foo wartość 4
MUL R1,R2     # * R1,R2      w R1 7*4
MOV #4,R1     # MOV t1,R1    w #4 - 28

'1+' -> t2 = b   +   t1
MOV R1,#1 //2
MOV R2,#4 //28
ADD R1,R2 //30 
MOV #5,R1 //

'2+' -> t3 = c   +   5
MOV R1,#2 //3
MOV R2,5  //5
ADD R1,R2 //8
MOV #6,R1 //

'1/' -> t4 = t3  /   2
MOV R1,#6 //8
MOV R2,2
DIV R1,R2  //4
MOV #7,R1

'1-' -> t5 = t2  -   t4
MOV R1,#5 //30 
MOV R2,#7 //4
SUB R1,R2 //26
MOV #8,R1

'1=' -> t6 = a   =   t5
MOV #0,#8


wynikowy kod:
00:int b = 2;
int c = 3;
int foo = 4;
MOV R1,7
MOV R2,#3
MUL R1,R2
MOV #4,R1
MOV R1,#1
MOV R2,#4
ADD R1,R2
MOV #5,R1
MOV R1,#2
MOV R2,5 
ADD R1,R2
MOV #6,R1
MOV R1,#6
MOV R2,2
DIV R1,R2
MOV #7,R1
MOV R1,#5
MOV R2,#7
SUB R1,R2
22:MOV #8,R1
23:MOV #0,#8