Probleme avec "using namespace std"

**lui88** · 22/07/2009, 00h38

Bonjour ,

j'ai un probleme avec using namespace std; que j'utilise dans mon programme
j'utilise pourtant souvent using namespace std mais l� je ne sais pas du tout ,j'ai aussi regard� dans la FAQ mais aucun resultat.merci de votre aide.

le compilateur me dit:
Erreur C2653: 'std'*: n'est pas un nom de classe ni d'espace de noms

Erreur C2676: '<<'*binaire : 'ostream' ne d�finit pas cet op�rateur ou une conversion vers un type acceptable pour l'op�rateur pr�d�fini

Erreur C2065: 'cout'*: identificateur non d�clar�

Erreur C2065: 'endl'*: identificateur non d�clar�

.h

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// Person-3.h
// Person class definition
 
#ifndef __Person_3_h__
#define __Person_3_h__
 
// class dependencies
 
using namespace std;
 
class ostream;
 
 
class Person
{
 // Attributes
 public:
	const char* get_first_name() const;
		// returns this person first name.
 
	void set_first_name(const char* new_first_name);
		// changes this person first name.
 
	const char* get_last_name() const;
		// returns this person last name.
 
	void set_last_name(const char* new_last_name);
		// changes this person last name.
 
	int get_age() const;
		// returns this person age.
 
	void set_age(int new_age);
		// changes this person age.
 
 // Operations
 public:
	 virtual void print(std::ostream& out) const;
		// dumps object properties to specified output stream.
 
 // Implementation
 public:
	Person();
		// constructs a not initialized (then invalid) person.
 
	Person(const Person& source_person);
		// constructs a person by duplicating an another one.
 
	Person(const char* first_name, const char* last_name, int age);
		// constructs a valid person.
 
	virtual ~Person();
		// frees this person and its allocated resources.
 
	Person& operator=(const Person& source_person);
		// overrides = operator for copy purpose.
 
 protected:
	char* _first_name;
		// this person first name (dynamic string).
 
	char* _last_name;
		// this person last name (dynamic string).
 
	int _age;
		// this person age.
};
 
 
// Inline functions implementation
 
 
inline const char* Person::get_first_name() const
{
	// returns person first name attribute
 
	cout << this << ".Person::get_first_name(); called" << endl;
 
 
	return _first_name;
}
 
 
inline const char* Person::get_last_name() const
{
	// returns person last name attribute
 
	cout << this << ".Person::get_last_name(); called" << endl;
 
 
	return _last_name;
}
 
 
inline int Person::get_age() const
{
	// returns person age attribute
 
	cout << this << ".Person::get_age(); called" << endl;
 
 
	return _age;
}
 
 
inline void Person::set_age(int new_age)
{
	// sets person age attribute
 
	cout << this << ".Person::set_age(new_age = \"" 
		<< new_age << "\"); called" << endl;
 
 
	_age = new_age;
}
 
#endif // __Person_3_h__

.Cpp

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// Person class implementation
 
#include <stdlib.h>
#include <iostream>
#include <stdafx.h>
#include <String.h>
 
#include "Person-3.h"
 
 
 
 
void Person::set_first_name(const char* new_first_name)
{
	// sets person first name attribute
 
	cout << this << ".Person::set_first_name(new_first_name = \"" 
		<< new_first_name << "\"); called" << endl;
 
 
	// delete previous first name if any
	if (_first_name != NULL)
		delete [] _first_name;
 
	// make an internal copy of passed string
	_first_name = new char [strlen(new_first_name) + 1];
	strcpy(_first_name, new_first_name);
}
 
 
void Person::set_last_name(const char* new_last_name)
{
	// sets person last name attribute
 
	cout << this << ".Person::set_last_name(new_last_name = \"" 
		<< new_last_name << "\"); called" << endl;
 
 
 
	// delete previous last name if any
	if (_last_name != NULL)
		delete [] _last_name;
 
	// make an internal copy of passed string
	_last_name = new char [strlen(new_last_name) + 1];
	strcpy(_last_name, new_last_name);
}
 
 
void Person::print(std::ostream& out) const
{
	// outputs person attributes
 
	cout << this << ".Person::print(out = " << &out << "); called" << endl;
 
 
	// output person info on specified output console
	out << _first_name << " " << _last_name << ", ";
	out << _age << " ans." << endl;
}
 
 
Person::Person()
{
	// constructs a not yet valid person
 
	cout << "Person::Person() called to construct " << this << endl;
 
 
	// set person initial state
	_first_name = NULL;
	_last_name = NULL;
	_age = -1;
}
 
 
Person::Person(const Person& source_person)
{
	// constructs a valid person by cloning
 
	cout << "Person::Person(source_person = " 
		<< &source_person << ") called to construct " << this << endl;
 
 
	// set person initial state
	_first_name = NULL;
	_last_name = NULL;
	_age = -1;
 
	// create person by cloning the specified one
	operator=(source_person);
}
 
 
Person::Person(const char* first_name, const char* last_name,
			   int age)
{
	// constructs a valid person from parameters
 
	cout << "Person::Person(first_name = \"" << first_name
		<< "\", last_name = \"" << last_name << "\", age = " << age 
		<< ") called to construct " << this << endl;
 
 
	// create person from passed parameters
	_first_name = NULL;
	set_first_name(first_name);
 
	_last_name = NULL;
	set_last_name(last_name);
 
	_age = age;
}
 
 
Person::~Person()
{
	// destructs this person
 
	cout << "Person::~Person() called to destruct " << this << endl;
 
 
	// free allocated resources
	if (_first_name != NULL)
		delete [] _first_name;
 
	if (_last_name != NULL)
		delete [] _last_name;
}
 
 
Person& Person::operator=(const Person& source_person)
{
	// sets person attributes by cloning
 
	cout << this << ".Person::operator=(source_person = "
		<< &source_person << ") called" << endl;
 
 
	// set this person attributes by cloning the passed person
	set_first_name(source_person._first_name);
	set_last_name(source_person._last_name);
	_age = source_person._age;
 
	return *this;
}

**3DArchi** · 22/07/2009, 08h07

Bonjour,
D'abord, l'utilisation de using namespace std dans un en-t�te est � bannir.
Ensuite, l'erreur est tout simplement li�e au fait que le namespace n'est pas d�finie dans ton fichier. Donc, tu cherches � utiliser quelque chose qui n'existe pas. Aucun de tes fichiers d'en-t�te ne le d�finit...