Pascal Program kasir

uses wincrt;
var
nama_barang : array[1..20] of string;
harga : array[1..20] of real;
banyak : array[1..20] of byte;
kata,grs :string;
x,y,i,j :byte;
Jum_Harga,Total_Harga,disc,Total_Bayar,uang :real;
begin
clrscr;
grs:='==================================================================';
kata:='Program Kasir';
x:=round((78-length(kata))/2);
gotoxy(x,2);writeln(kata);
x:=round((78-length(grs))/2);
gotoxy(x,3);write(grs);
{-----------------------------}
gotoxy(x,4);write('Data Belanja');
gotoxy(x,5);write(grs);
gotoxy(x,6);writeln('| No | Nama Barang       | Harga Satuan  | Banyak | Jumlah Harga |');
gotoxy(x,7);write(grs);
{--------------------------------------------------------------------}
i:=0;
Total_Harga:=0;
repeat
i:=i+1;
gotoxy(x,7+i);write('| ',i);
gotoxy(x+5,7+i);write('|');
gotoxy(x+7,7+i);readln(Nama_barang[i]);
if Nama_Barang[i] <>'' then begin
gotoxy(x+25,7+i);write('|');
gotoxy(x+28,7+i);readln(Harga[i]);
gotoxy(x+28,7+i);writeln(Harga[i]:10:2);
gotoxy(x+41,7+i);write('|');
gotoxy(x+44,7+i);readln(Banyak[i]);
gotoxy(x+50,7+i);write('|');
Jum_Harga:=Harga[i]*Banyak[i];
gotoxy(x+53,7+i);writeln(Jum_Harga:10:2);
gotoxy(x+65,7+i);writeln('|');
Total_Harga:=Total_Harga+Jum_Harga ; end;
until nama_barang[i]='';
{--------------------------------------------------------------------}
disc:=0;
if (Total_Harga > 10000) and (Total_Harga <100000) then
disc:=0.05 * Total_Harga
else
if (Total_Harga >= 100000 ) then
disc:=0.1 *Total_Harga;
{--------------------------------------------------------------------}
kata:='Faktur Penjualan';
y:=round((78-length(kata))/2);
gotoxy(y,2);writeln(kata);
j:=i-1;
gotoxy(x,8+j);write(grs);
gotoxy(x,8+j+1);write('Total Belanja :');
gotoxy(x+53,8+j+1);write(Total_Harga:10:2);
gotoxy(x,8+j+2);write('Discount :');
gotoxy(x+53,8+j+2);write(disc:10:2);
gotoxy(x,8+j+3);write(grs);
gotoxy(x,8+j+4);write('Total Bayar setelah discount :');
Total_Bayar:=Total_Harga-disc;
gotoxy(x+53,8+j+4);write(Total_Bayar:10:2);
gotoxy(x,8+j+5);write('Uang diBayar');
gotoxy(x+53,8+j+5);readln(Uang);
gotoxy(x+53,8+j+5);writeln(Uang:10:2);
gotoxy(x,8+j+6);Write(grs);
gotoxy(x,8+j+7);write('Uang Kembali');
gotoxy(x+53,8+j+7);write(Uang-Total_Bayar:10:2);
end.