[C++] Rubrica

[sir daniel]

Ciao a tutti.
Sto cercando di creare una rubrica in C++.
Fin ora ho tirato giù questo codice:

#include <iostream>
#include <fstream>
using namespace std;

bool write_ppl(); //prototipo della funzione write_ppl()
void ask_pll(); //prototipo della funzione ask_ppl()

int main()
{

int scelta;
char s[];

while (1)
{
cout<<"1- Leggere la rubrica"<<endl;
cout<<"2- Aggiungere un nuovo contatto"<<endl;
//cout<<"3- Uscire"<<endl; da implementare
cin>>scelta;

switch(scelta)
{
case (1):
{
fstream txt=("docs/ppl.txt", ios:ut);
txt>>s;
txt.close()
cout <<s;
break;
}
case (2):
{
write_ppl();
break;
}
default:
{continue;}
}
}
return 0;
}

//funzione che scrive i contatti sul file docs/ppl.txt
bool write_ppl()
{
string nome[15], cognome[15], email[50], tel[10];

fstream txt=("docs/ppl.txt", ios::in);

cout<<"Inserisci il nome: "<<endl;
cin>>nome;
cout<<"Inserisci il cognome: "<<endl;
cin>>cognome;
cout<<"Inserisci l'email: "<<endl;
cin>>email;
cout<<"Inserisci il numero di telefono: "<<endl;
cin>>tel;

txt <<nome<<" "<<cognome<<" - "<<tel<<" - "<<email; //scrivo i dati nel file
txt.close();

return true;
}

appena do il comando:
g++ -c RuC++.cpp
per compilare il programma mi da una sfilza di errori:

RuC++.cpp: In function ‘int main()’:
RuC++.cpp:12: error: storage size of ‘s’ isn't known
RuC++.cpp:25: error: conversion from ‘const std::_Ios_Openmode’ to non-scalar type ‘std::fstream’ requested
RuC++.cpp: In function ‘bool write_ppl()’:
RuC++.cpp:47: error: conversion from ‘const std::_Ios_Openmode’ to non-scalar type ‘std::fstream’ requested
RuC++.cpp:50: error: no match for ‘operator>>’ in ‘std::cin >> nome’
/usr/include/c++/4.3/istream:123: note: candidates are: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(std::basic_istream<_CharT, _Traits>& (*)(std::basic_istream<_CharT, _Traits>&)) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:127: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(std::basic_ios<_CharT, _Traits>& (*)(std::basic_ios<_CharT, _Traits>&)) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:134: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(std::ios_base& (*)(std::ios_base&)) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:170: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(bool&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:174: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(short int&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:177: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(short unsigned int&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:181: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(int&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:184: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(unsigned int&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:188: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(long int&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:192: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(long unsigned int&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:197: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(long long int&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:201: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(long long unsigned int&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:206: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(float&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:210: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(double&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:214: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(long double&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:218: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(void*&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:242: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(std::basic_streambuf<_CharT, _Traits>*) [with _CharT = char, _Traits = std::char_traits<char>]
RuC++.cpp:52: error: no match for ‘operator>>’ in ‘std::cin >> cognome’
/usr/include/c++/4.3/istream:123: note: candidates are: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(std::basic_istream<_CharT, _Traits>& (*)(std::basic_istream<_CharT, _Traits>&)) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:127: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(std::basic_ios<_CharT, _Traits>& (*)(std::basic_ios<_CharT, _Traits>&)) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:134: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(std::ios_base& (*)(std::ios_base&)) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:170: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(bool&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:174: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(short int&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:177: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(short unsigned int&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:181: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(int&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:184: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(unsigned int&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:188: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(long int&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:192: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(long unsigned int&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:197: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(long long int&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:201: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(long long unsigned int&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:206: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(float&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:210: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(double&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:214: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(long double&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:218: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(void*&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:242: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(std::basic_streambuf<_CharT, _Traits>*) [with _CharT = char, _Traits = std::char_traits<char>]
RuC++.cpp:54: error: no match for ‘operator>>’ in ‘std::cin >> email’
/usr/include/c++/4.3/istream:123: note: candidates are: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(std::basic_istream<_CharT, _Traits>& (*)(std::basic_istream<_CharT, _Traits>&)) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:127: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(std::basic_ios<_CharT, _Traits>& (*)(std::basic_ios<_CharT, _Traits>&)) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:134: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(std::ios_base& (*)(std::ios_base&)) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:170: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(bool&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:174: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(short int&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:177: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(short unsigned int&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:181: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(int&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:184: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(unsigned int&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:188: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(long int&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:192: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(long unsigned int&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:197: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(long long int&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:201: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(long long unsigned int&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:206: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>:perator>>(float&) [with _CharT = char, _Traits = std::char_traits<char>]

e altri

Perchè mi dice che non conosce le funzioni di fstream? sta inclusa la libreria...
Sono su ubuntu 8.10 e compilo con g++

[oregon]

Sei sicuro che questa

fstream txt=("docs/ppl.txt", ios:ut);

sia la sintassi corretta?

[sir daniel]

credo di si

fstream dovrebbe aprire il file sia in lettura che scrittura, e ios:ut dice che deve aprirlo in lettura.
Sbaglio?

EDIT: Ho corretto la sintassi, quegli errori non me li da più. ma questo?
RuC++.cpp: In function ‘bool write_ppl()’:
RuC++.cpp:42: error: no match for ‘operator>>’ in ‘std::cin >> nome’

cioè non mi conosce nemmeno il cin>>???

[oregon]

Originariamente inviato da sir daniel
RuC++.cpp:42: error: no match for ‘operator>>’ in ‘std::cin >> nome’

cioè non mi conosce nemmeno il cin>>???

Veramente il messaggio d'errore si riferisce solo all'operatore >> ed e' giusto perche' il tipo di dato che vuoi usare (string, dato che nome e' di tipo string) non e' conosciuto in quanto manca

#include <string>

[sir daniel]

ok, ho cancellato parti di codice, vado avanti un pò più piano.
Ora sono arrivato a questo punto:

#include <iostream>
#include <stdio.h>
#include <string>
using namespace std;

int write_ppl(); //prototipo della funzione write_ppl()

int main()
{

short int scelta;

while (1)
{
cout<<"1- Leggere la rubrica"<<endl;
cout<<"2- Aggiungere un nuovo contatto"<<endl;
//cout<<"3- Uscire"<<endl; da implementare
cin>>scelta;

switch(scelta)
{
case (1):
{
break;
}
case (2):
{
write_ppl();
break;
}
default:
{continue;}
}
}
return 0;
}

//funzione che scrive i contatti sul file docs/ppl.txt
int write_ppl()
{
char stringa[4][50];

cout << "Inserisci il nome: " << endl;
cin >> stringa[1][15];
cout << "Inserisci il cognome: " << endl;
cin >> stringa[2][15];
cout << "Inserisci l'email: " << endl;
cin >> stringa[3][50];
cout << "Inserisci il numero di telefono: " << endl;
cin >> stringa[4][10];

FILE * dati;
dati=fopen("docs/ppl.txt", "w");
fwrite(stringa, 1, sizeof(stringa), dati);
fclose(dati);
return 1;
}

Non riesco proprio a farlo scrivere sul file... nè in questo modo nè in quello precedente.

[oregon]

E perche' non usi piu' l'oggetto fstream?

[sir daniel]

perchè non riuscivo a farlo scrivere con quello ed ho provato con fwrite

[oregon]

Originariamente inviato da sir daniel
perchè non riuscivo a farlo scrivere con quello ed ho provato con fwrite

Scusa ... cerca di trovare il problema con quello ... ora hai un altro codice che non funziona, che fai, ne scrivi un terzo?

Ritorna a quello precedente e vediamo cosa non va ...

[sir daniel]

Ok, ecco qui:

//funzione che scrive i contatti sul file docs/ppl.txt
int write_ppl()
{
string stringa, nome, cognome, email, tel;

cout << "Inserisci il nome: " << endl;
cin >> nome;
cout << "Inserisci il cognome: " << endl;
cin >> cognome;
cout << "Inserisci l'email: " << endl;
cin >> email;
cout << "Inserisci il numero di telefono: " << endl;
cin >> tel;

stringa=nome+" "+cognome+" - Tel: "+tel+" - email: "+email;
ifstream dati=("docs/ppl.txt", 'a');
dati << stringa; //equivale a fwrite
//dovrebbe funzionare anche con dati.write(stringa) ma non funziona.
dati.close();
}

E l'errore:

RuC++.cpp: In function ‘int write_ppl()’:
RuC++.cpp:53: error: conversion from ‘char’ to non-scalar type ‘std::ifstream’ requested
RuC++.cpp:54: error: no match for ‘operator<<’ in ‘dati << stringa’

[oregon]

Ti avevo gia' detto che questa

ifstream dati=("docs/ppl.txt", 'a');

era sbagliata ... e avevi risposto di avere risolto ...

L' = non ci va ...