pemprograman persamaan kuadrat TPW

1. Program Persamaan Kuadrat
program perskuadrat;
uses wincrt;
var
name : string;
Mau_coba_lagi : string;
a,b,c,D,x1,x2:real;
begin
repeat
clrscr;
writeln('Welcome to Program Persamaan Kuadrat');
write('Masukkan nilai a: '); readln(a);
if a=0 then
begin
writeln('Maaf nilai a tidak boleh sama dengan 0');
end
else
begin
write('Masukkan nilai b: '); readln(b);
write('Masukkan nilai c: '); readln(c);
D:=(b*b)-(4*a*c);
writeln('D = ',D:5:2);
if D<0 then
begin
writeln('D<0');
writeln('x1 dan x2 tidak real atau imajiner');
end
else if D=0 then
begin
writeln('D=0');
writeln('x1 dan x2 real dan sama');
x1:=(-b+(sqrt(D)))/(2*a);

2. x2:=(-b-(sqrt(D)))/(2*a);
writeln('x1= ',x1:5:2);
writeln('x2= ',x2:5:2);
end
else if D>0 then
begin
writeln('D>0');
writeln('x1 dan x2 real dan berlainan');
x1:=(-b+(sqrt(D)))/(2*a);
x2:=(-b-(sqrt(D)))/(2*a);
writeln('x1= ',x1:5:2);
writeln('x2= ',x2:5:2);
end;
end;
writeln('Mau coba lagi ? Y or N'); readln(Mau_coba_lagi);
until Mau_coba_lagi='N'
end.