This program solves quadratic equations by taking user input for values a, b, and c. It then calculates the discriminant D and determines if the roots are real/imaginary or equal/different based on whether D is less than, equal to, or greater than 0. The program outputs the calculated roots and asks the user if they want to try another equation.

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.