1.txt

编译器包括词法分析器,语法分析器,最后生成四元式

program example;
var
     a:=1,b:=3,c:=2:integer;
x:char;
begin
if(a+c*3>b) and (b>3) then c:=3;
x:=2+(3*a)-b*c*8;
if(2+3>a) and (b>3) and (a>c) then c:=3;
for x:=1+2 to 3 do b:=100;
while a>b do c:=5;
for x:=1+d to 3 do b:=15;
while t>b do c:=5;
repeat a:=10; until a>b;
end.