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| program postefixee;
uses crt;
type
priorite=array[-5..-1] of integer;
exp=array[1..30] of integer;
pile=array[1..50] of integer;
var exp1,symb:string;
ch:char;
i,j,k,vale,p:integer;
exp2,PF:exp;{PF:tableau de la postefixee}
PPF,pev:pile; {PPF pile de pf pour les opérand}
s1,s2:integer; {s1:sommet de PPF}
psp,pss:priorite;
result,opd1,opd2:integer;
procedure init_pile(p:pile;sommet:integer);
begin
sommet:=0;
end;
function pilevide(p:pile;sommet:integer):boolean;
begin
if sommet=0 then pilevide:=true else pilevide:=false;
end;
function pileplaine(p:pile;sommet:integer):boolean;
begin
if sommet=50 then pileplaine:=true else pileplaine:=false;
end;
procedure empiler(var p:pile;var sommet:integer;var t:integer);
begin
sommet:=sommet+1;
p[sommet]:=t;
end;
function depiler(var p:pile;var sommet:integer):integer;
begin
depiler:=p[sommet];
sommet:=sommet-1;
end;
function puis(var x:integer;var y:integer):integer;
var z:integer;
begin
z:=1;
while y>0 do
begin
z:=z*x;
y:=y-1;
end;
puis:=z;
end;
{******** debut du programme *********}
begin
repeat
begin
clrscr;
writeln(' TP N 2 D''ALGORITHMIQUE ');
writeln(' Evaluation d''une expression arithmitique ');
symb:='0123456789';
exp1:='';
writeln('saisie l''expression');
write(' :');
readln(exp1);
i:=1;
j:=1;
{************ codage de l'expression ************}
while(i<=length(exp1)) do
begin
case exp1[i] of
'*':begin
exp2[j]:=-1;
j:=j+1;
end;
'/':begin
exp2[j]:=-2;
j:=j+1;
end;
'^':begin
exp2[j]:=-3;
j:=j+1;
end;
'+':begin
exp2[j]:=-4;
j:=j+1;
end;
'-':begin
exp2[j]:=-5;
j:=j+1;
end;
'(':begin
exp2[j]:=-6;
j:=j+1;
end;
')':begin
exp2[j]:=-7;
j:=j+1;
end;
'0','1','2','3','4','5','6','7','8','9':
begin
vale:=pos(exp1[i],symb)-1;
while(exp1[i+1] in ['0','1','2','3','4','5','6','7','8','9']) do
begin
p:=pos(exp1[i+1],symb)-1;
vale:=vale*10+p;
i:=i+1;
end;
exp2[j]:=vale;
j:=j+1;
end;
end; {end de case}
i:=i+1;
end; {end de while}
j:=j-1; {pour garder la taille reel de exp2}
{************* fin codage **************}
{************* la postefixee ***********}
psp[-1]:=2; pss[-1]:=2;
psp[-2]:=2; pss[-2]:=2;
psp[-3]:=3; pss[-3]:=3;
psp[-4]:=1; pss[-4]:=1;
psp[-5]:=1; pss[-5]:=1;
init_pile(ppf,s1);
i:=1;
k:=1;
while i<j+1 do
begin
if exp2[i]>=0 then
begin
PF[k]:=exp2[i];
k:=k+1;
end
else if exp2[i]=-6 then
begin
i:=i+1;
repeat
begin
if exp2[i]>=0 then
begin
PF[k]:=exp2[i];
k:=k+1;
end
else empiler(PPF,s1,exp2[i]);
end;
i:=i+1;
until exp2[i]=-7;
i:=i-1;
end
else if (exp2[i]=-7) then
begin
while pilevide(ppf,s1)=false do
begin
PF[k]:=depiler(PPF,s1);
k:=k+1;
end;
end
else if (exp2[i]<0) and (exp2[i]<>-6) and (exp2[i]<>-7) then
begin
if pilevide(ppf,s1)=true then
begin
empiler(ppf,s1,exp2[i]);
end
else if (pss[exp2[i]]>psp[ppf[s1]]) then
begin
empiler(ppf,s1,exp2[i]);
end
else begin
while pilevide(ppf,s1)=false do
begin
PF[k]:=depiler(PPF,s1);
k:=k+1;
end;
empiler(ppf,s1,exp2[i]);
end;
end;
i:=i+1;
end; {**end de while**}
while pilevide(ppf,s1)=false do
begin
PF[k]:=depiler(PPF,s1);
k:=k+1;
end;
{************** fin de la postefixee *******************}
{***************l'evaluation postefixee ***************}
init_pile(pev,s2);
for i:=1 to k-2 do
begin
if pf[i]>=0 then
begin
empiler(pev,s2,pf[i]);
end
else
begin
opd1:=depiler(pev,s2);
opd2:=depiler(pev,s2);
case pf[i] of
-1:result:=opd2*opd1;
-2:result:=opd2 div opd1;
-3:result:=puis(opd2,opd1);
-4:result:=opd2+opd1;
-5:result:=opd2-opd1;
end;
empiler(pev,s2,result);
end;
end;
{********* fin l'evaluation *********}
writeln('l''expression après le codage :');
for i:=1 to j do write(' ',exp2[i]);
writeln;
writeln('l''expression code après pf:');
for i:=1 to k-1 do write(' ',pf[i]);
writeln;
writeln('la postefixee:');
for i:=1 to k-1 do
begin
if pf[i]>=0 then
write(' ',pf[i])
else
begin
case pf[i] of
-1:write(' * ');
-2:write(' / ');
-3:write(' ^ ');
-4:write(' + ');
-5:write(' - ');
end;
end;
end;
writeln;
writeln('resultat=',result);
write('Repeter (o/n):');
readln(ch);
end;
until ch='n';
end. |
