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Lenguaje
Pascal
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Descripción
Una tienda requiere registrar las películas que renta durante un mes, para ello se requiere que realice la aplicación usando una base de datos. La aplicación debe permitir ingresar una película, eliminar una película y actualizar el título de una película haciendo uso de clases y métodos.
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program program_peliculas;
uses cmem, crt, sysutils;
type Comparable = function (const datum1 : pointer; const datum2 : pointer) : integer;
type ForEachFunction = procedure (datum : pointer; params : pointer);
type Pelicula = object
codigo_de_barras : string;
titulo : string;
genero : string;
clasificacion : char;
ano : integer;
idioma : char;
end;
type pPelicula = ^Pelicula;
function compare_pelicula (const pelicula1 : pPelicula; const pelicula2 : pPelicula) : integer;
begin
compare_pelicula := strcomp (@pelicula1^.codigo_de_barras[1], @pelicula2^.codigo_de_barras[1]);
end;
function read_str (message : string) : string;
var string_var : string;
begin
write (stdout, message, ': ');
readln (string_var);
read_str := string_var;
end;
function read_integer (message : string) : integer;
var integer_var : integer;
begin
write (stdout, message, ': ');
readln (integer_var);
read_integer := integer_var;
end;
function read_character (message : string) : char;
var char_var : char;
begin
write (stdout, message, ': ');
readln (char_var);
read_character := char_var;
end;
function read_field (var file_stream : text; var field : string) : boolean;
var c : char;
begin
field := '';
while not eof (file_stream) do
begin
read (file_stream, c);
if (c=#13) then
continue;
if (c=#9) or (c=#10) then
begin
read_field := true;
exit;
end
else
field := field + c;
end;
read_field := false;
end;
type pinteger = ^integer;
procedure print_pelicula (datum : pPelicula; counter : pinteger);
begin
writeln (stdout, 'codigo de barras: ', datum^.codigo_de_barras);
writeln (stdout, 'titulo : ', datum^.titulo);
writeln (stdout, 'genero : ', datum^.genero);
writeln (stdout, 'clasificacion : ', datum^.clasificacion);
writeln (stdout, 'ano : ', datum^.ano);
writeln (stdout, 'idioma : ', datum^.idioma);
writeln (stdout);
inc (counter^);
end;
type pText = ^text;
procedure print_on_file (datum : pPelicula; file_stream : pText);
begin
write (file_stream^, datum^.codigo_de_barras, #9);
write (file_stream^, datum^.titulo, #9);
write (file_stream^, datum^.genero, #9);
write (file_stream^, datum^.clasificacion, #9);
write (file_stream^, datum^.ano, #9);
write (file_stream^, datum^.idioma, #10);
end;
type ppointer = ^pointer;
type ppPelicula = ^pPelicula;
function array_insert (array_var : ppointer; var length : integer; datum : pointer) : ppointer;
begin
array_var := realloc (array_var, sizeof (pointer) * (length+1));
array_var[length] := datum;
inc (length);
array_insert := array_var;
end;
function array_search (array_var : ppointer; length : integer; compare: Comparable; const datum : pointer) : pointer;
begin
if length > 0 then
if compare (array_var[0], datum) = 0 then
array_search := array_var[0]
else
array_search := array_search (array_var + 1, length - 1, compare, datum)
else
array_search := nil;
end;
function array_remove (array_var : ppointer; var length : integer; const datum : pointer) : ppointer;
var i : integer = 0;
begin
while (i<length) and (datum<>array_var[i]) do
inc (i);
if i<length then
begin
for i:=i+1 to length-1 do
array_var[i-1] := array_var[i];
dec (length);
array_var := realloc (array_var, sizeof (pointer) * length);
end;
array_remove := array_var;
end;
procedure quick_sort (array_var : ppointer; first_index : integer; last_index : integer; compare: Comparable);
var smaller, bigger : integer;
var pivot : pointer;
begin
smaller := first_index;
bigger := last_index;
if last_index>first_index then
begin
pivot := array_var[(first_index+last_index) div 2];
while smaller <= bigger do
begin
while (smaller < last_index) and (compare (array_var[smaller], pivot)<0) do
inc (smaller);
while (bigger > first_index) and (compare (array_var[bigger], pivot)>0) do
dec (bigger);
if smaller <= bigger then
begin
pivot := array_var[smaller];
array_var[smaller] := array_var[bigger];
array_var[bigger] := pivot;
inc (smaller);
dec (bigger);
end;
end;
if first_index < bigger then
quick_sort (array_var, first_index, bigger, compare);
if smaller < last_index then
quick_sort (array_var, smaller, last_index, compare);
end;
end;
procedure array_foreach (array_var : ppointer; length : integer; params : pointer; func : ForEachFunction);
begin
if length>0 then
begin
func (array_var[0], params);
array_foreach (array_var + 1, length - 1, params, func);
end;
end;
const path = 'peliculas.tsv';
var datum : ^Pelicula = nil;
var pelicula1 : Pelicula;
var main_option : char;
var counter, suboption : integer;
var field : string = '';
var file_stream : text;
var peliculas : ppPelicula = nil;
var length : integer = 0;
begin
counter := 0;
if fileexists (path) then
begin
assign (file_stream, path);
reset (file_stream);
while read_field (file_stream, field) do
begin
new (datum);
datum^.codigo_de_barras := field;
read_field (file_stream, field);
datum^.titulo := field;
read_field (file_stream, field);
datum^.genero := field;
read_field (file_stream, field);
datum^.clasificacion := field;
read_field (file_stream, field);
val (field, datum^.ano);
read_field (file_stream, field);
datum^.idioma := field;
peliculas := ppPelicula (array_insert (ppointer (peliculas), length, datum));
end;
close (file_stream);
end;
repeat
clrscr;
writeln (stdout, 'MEN'#233#10#13);
writeln (stdout, '1.- Altas');
writeln (stdout, '2.- Consultas');
writeln (stdout, '3.- Actualizaciones');
writeln (stdout, '4.- Bajas');
writeln (stdout, '5.- Ordenar registros');
writeln (stdout, '6.- Listar registros');
writeln (stdout, '7.- Salir');
write (stdout, 'Selecciona una opci'#162'n: ');
repeat
main_option := readkey;
until (main_option>='1') and (main_option<='7');
writeln (stdout, main_option, #10#13);
if (peliculas = nil) and (main_option <> '1') and (main_option <> '7') then
begin
write (stdout, 'No hay registros.'#10#13#10#13'Presiona una tecla para continuar . . . ');
readkey;
continue;
end;
if main_option<'5' then
begin
pelicula1.codigo_de_barras := read_str ('Ingresa el codigo de barras del pelicula');
datum := array_search (ppointer (peliculas), length, Comparable(@compare_pelicula), @pelicula1);
if datum <> nil then
begin
writeln (stdout);
print_pelicula (datum, @counter);
end;
end;
if (main_option = '1') and (datum <> nil) then
writeln (stdout, 'El registro ya existe.')
else if (main_option>='2') and (main_option<='4') and (datum = nil) then
writeln (stdout, #10#13'Registro no encontrado.')
else case main_option of
'1':
begin
new (datum);
datum^.codigo_de_barras := pelicula1.codigo_de_barras;
datum^.titulo := read_str ('Ingresa el titulo');
datum^.genero := read_str ('Ingresa el genero');
datum^.clasificacion := read_character ('Ingresa el clasificacion');
datum^.ano := read_integer ('Ingresa el ano');
datum^.idioma := read_character ('Ingresa el idioma');
peliculas := ppPelicula (array_insert (ppointer (peliculas), length, datum));
writeln (stdout, #10#13'Registro agregado correctamente.');
end;
'3':
begin
writeln (stdout, 'Men'#163' de actualizaci'#162'n de campos');
writeln (stdout, '1.- titulo');
writeln (stdout, '2.- genero');
writeln (stdout, '3.- clasificacion');
writeln (stdout, '4.- ano');
writeln (stdout, '5.- idioma');
repeat
suboption := read_integer ('Selecciona el n'#163'mero de campo a modificar');
if (suboption<1) or (suboption>5) then
writeln (stdout, 'Opci'#162'n incorrecta');
until (suboption>=1) and (suboption<=5);
case suboption of
1: datum^.titulo := read_str ('Ingresa el nuevo titulo');
2: datum^.genero := read_str ('Ingresa el nuevo genero');
3: datum^.clasificacion := read_character ('Ingresa el nuevo clasificacion');
4: datum^.ano := read_integer ('Ingresa el nuevo ano');
5: datum^.idioma := read_character ('Ingresa el nuevo idioma');
end;
writeln (stdout, #10#13'Registro actualizado correctamente.');
end;
'4':
begin
peliculas := ppPelicula (array_remove (ppointer (peliculas), length, datum));
dispose (datum);
writeln (stdout, 'Registro eliminado correctamente.');
end;
'5':
begin
quick_sort (ppointer (peliculas), 0, length - 1, Comparable(@compare_pelicula));
writeln (stdout, 'Registros ordenados correctamente.');
end;
'6':
begin
counter := 0;
array_foreach (ppointer (peliculas), length, @counter, ForEachFunction (@print_pelicula));
writeln (stdout, 'Total de registros: ', counter, '.');
end;
end;
if (main_option<'7') then
begin
write (stdout, #10#13'Presiona una tecla para continuar . . . ');
readkey;
end;
until main_option = '7';
assign (file_stream, path);
rewrite (file_stream);
array_foreach (ppointer (peliculas), length, @file_stream, ForEachFunction (@print_on_file));
close (file_stream);
end.
uses cmem, crt, sysutils;
type Comparable = function (const datum1 : pointer; const datum2 : pointer) : integer;
type ForEachFunction = procedure (datum : pointer; params : pointer);
type Pelicula = object
codigo_de_barras : string;
titulo : string;
genero : string;
clasificacion : char;
ano : integer;
idioma : char;
end;
type pPelicula = ^Pelicula;
function compare_pelicula (const pelicula1 : pPelicula; const pelicula2 : pPelicula) : integer;
begin
compare_pelicula := strcomp (@pelicula1^.codigo_de_barras[1], @pelicula2^.codigo_de_barras[1]);
end;
function read_str (message : string) : string;
var string_var : string;
begin
write (stdout, message, ': ');
readln (string_var);
read_str := string_var;
end;
function read_integer (message : string) : integer;
var integer_var : integer;
begin
write (stdout, message, ': ');
readln (integer_var);
read_integer := integer_var;
end;
function read_character (message : string) : char;
var char_var : char;
begin
write (stdout, message, ': ');
readln (char_var);
read_character := char_var;
end;
function read_field (var file_stream : text; var field : string) : boolean;
var c : char;
begin
field := '';
while not eof (file_stream) do
begin
read (file_stream, c);
if (c=#13) then
continue;
if (c=#9) or (c=#10) then
begin
read_field := true;
exit;
end
else
field := field + c;
end;
read_field := false;
end;
type pinteger = ^integer;
procedure print_pelicula (datum : pPelicula; counter : pinteger);
begin
writeln (stdout, 'codigo de barras: ', datum^.codigo_de_barras);
writeln (stdout, 'titulo : ', datum^.titulo);
writeln (stdout, 'genero : ', datum^.genero);
writeln (stdout, 'clasificacion : ', datum^.clasificacion);
writeln (stdout, 'ano : ', datum^.ano);
writeln (stdout, 'idioma : ', datum^.idioma);
writeln (stdout);
inc (counter^);
end;
type pText = ^text;
procedure print_on_file (datum : pPelicula; file_stream : pText);
begin
write (file_stream^, datum^.codigo_de_barras, #9);
write (file_stream^, datum^.titulo, #9);
write (file_stream^, datum^.genero, #9);
write (file_stream^, datum^.clasificacion, #9);
write (file_stream^, datum^.ano, #9);
write (file_stream^, datum^.idioma, #10);
end;
type ppointer = ^pointer;
type ppPelicula = ^pPelicula;
function array_insert (array_var : ppointer; var length : integer; datum : pointer) : ppointer;
begin
array_var := realloc (array_var, sizeof (pointer) * (length+1));
array_var[length] := datum;
inc (length);
array_insert := array_var;
end;
function array_search (array_var : ppointer; length : integer; compare: Comparable; const datum : pointer) : pointer;
begin
if length > 0 then
if compare (array_var[0], datum) = 0 then
array_search := array_var[0]
else
array_search := array_search (array_var + 1, length - 1, compare, datum)
else
array_search := nil;
end;
function array_remove (array_var : ppointer; var length : integer; const datum : pointer) : ppointer;
var i : integer = 0;
begin
while (i<length) and (datum<>array_var[i]) do
inc (i);
if i<length then
begin
for i:=i+1 to length-1 do
array_var[i-1] := array_var[i];
dec (length);
array_var := realloc (array_var, sizeof (pointer) * length);
end;
array_remove := array_var;
end;
procedure quick_sort (array_var : ppointer; first_index : integer; last_index : integer; compare: Comparable);
var smaller, bigger : integer;
var pivot : pointer;
begin
smaller := first_index;
bigger := last_index;
if last_index>first_index then
begin
pivot := array_var[(first_index+last_index) div 2];
while smaller <= bigger do
begin
while (smaller < last_index) and (compare (array_var[smaller], pivot)<0) do
inc (smaller);
while (bigger > first_index) and (compare (array_var[bigger], pivot)>0) do
dec (bigger);
if smaller <= bigger then
begin
pivot := array_var[smaller];
array_var[smaller] := array_var[bigger];
array_var[bigger] := pivot;
inc (smaller);
dec (bigger);
end;
end;
if first_index < bigger then
quick_sort (array_var, first_index, bigger, compare);
if smaller < last_index then
quick_sort (array_var, smaller, last_index, compare);
end;
end;
procedure array_foreach (array_var : ppointer; length : integer; params : pointer; func : ForEachFunction);
begin
if length>0 then
begin
func (array_var[0], params);
array_foreach (array_var + 1, length - 1, params, func);
end;
end;
const path = 'peliculas.tsv';
var datum : ^Pelicula = nil;
var pelicula1 : Pelicula;
var main_option : char;
var counter, suboption : integer;
var field : string = '';
var file_stream : text;
var peliculas : ppPelicula = nil;
var length : integer = 0;
begin
counter := 0;
if fileexists (path) then
begin
assign (file_stream, path);
reset (file_stream);
while read_field (file_stream, field) do
begin
new (datum);
datum^.codigo_de_barras := field;
read_field (file_stream, field);
datum^.titulo := field;
read_field (file_stream, field);
datum^.genero := field;
read_field (file_stream, field);
datum^.clasificacion := field;
read_field (file_stream, field);
val (field, datum^.ano);
read_field (file_stream, field);
datum^.idioma := field;
peliculas := ppPelicula (array_insert (ppointer (peliculas), length, datum));
end;
close (file_stream);
end;
repeat
clrscr;
writeln (stdout, 'MEN'#233#10#13);
writeln (stdout, '1.- Altas');
writeln (stdout, '2.- Consultas');
writeln (stdout, '3.- Actualizaciones');
writeln (stdout, '4.- Bajas');
writeln (stdout, '5.- Ordenar registros');
writeln (stdout, '6.- Listar registros');
writeln (stdout, '7.- Salir');
write (stdout, 'Selecciona una opci'#162'n: ');
repeat
main_option := readkey;
until (main_option>='1') and (main_option<='7');
writeln (stdout, main_option, #10#13);
if (peliculas = nil) and (main_option <> '1') and (main_option <> '7') then
begin
write (stdout, 'No hay registros.'#10#13#10#13'Presiona una tecla para continuar . . . ');
readkey;
continue;
end;
if main_option<'5' then
begin
pelicula1.codigo_de_barras := read_str ('Ingresa el codigo de barras del pelicula');
datum := array_search (ppointer (peliculas), length, Comparable(@compare_pelicula), @pelicula1);
if datum <> nil then
begin
writeln (stdout);
print_pelicula (datum, @counter);
end;
end;
if (main_option = '1') and (datum <> nil) then
writeln (stdout, 'El registro ya existe.')
else if (main_option>='2') and (main_option<='4') and (datum = nil) then
writeln (stdout, #10#13'Registro no encontrado.')
else case main_option of
'1':
begin
new (datum);
datum^.codigo_de_barras := pelicula1.codigo_de_barras;
datum^.titulo := read_str ('Ingresa el titulo');
datum^.genero := read_str ('Ingresa el genero');
datum^.clasificacion := read_character ('Ingresa el clasificacion');
datum^.ano := read_integer ('Ingresa el ano');
datum^.idioma := read_character ('Ingresa el idioma');
peliculas := ppPelicula (array_insert (ppointer (peliculas), length, datum));
writeln (stdout, #10#13'Registro agregado correctamente.');
end;
'3':
begin
writeln (stdout, 'Men'#163' de actualizaci'#162'n de campos');
writeln (stdout, '1.- titulo');
writeln (stdout, '2.- genero');
writeln (stdout, '3.- clasificacion');
writeln (stdout, '4.- ano');
writeln (stdout, '5.- idioma');
repeat
suboption := read_integer ('Selecciona el n'#163'mero de campo a modificar');
if (suboption<1) or (suboption>5) then
writeln (stdout, 'Opci'#162'n incorrecta');
until (suboption>=1) and (suboption<=5);
case suboption of
1: datum^.titulo := read_str ('Ingresa el nuevo titulo');
2: datum^.genero := read_str ('Ingresa el nuevo genero');
3: datum^.clasificacion := read_character ('Ingresa el nuevo clasificacion');
4: datum^.ano := read_integer ('Ingresa el nuevo ano');
5: datum^.idioma := read_character ('Ingresa el nuevo idioma');
end;
writeln (stdout, #10#13'Registro actualizado correctamente.');
end;
'4':
begin
peliculas := ppPelicula (array_remove (ppointer (peliculas), length, datum));
dispose (datum);
writeln (stdout, 'Registro eliminado correctamente.');
end;
'5':
begin
quick_sort (ppointer (peliculas), 0, length - 1, Comparable(@compare_pelicula));
writeln (stdout, 'Registros ordenados correctamente.');
end;
'6':
begin
counter := 0;
array_foreach (ppointer (peliculas), length, @counter, ForEachFunction (@print_pelicula));
writeln (stdout, 'Total de registros: ', counter, '.');
end;
end;
if (main_option<'7') then
begin
write (stdout, #10#13'Presiona una tecla para continuar . . . ');
readkey;
end;
until main_option = '7';
assign (file_stream, path);
rewrite (file_stream);
array_foreach (ppointer (peliculas), length, @file_stream, ForEachFunction (@print_on_file));
close (file_stream);
end.