Fichier en c++

#include <iostream>
#include <ostream>
#include <fstream>
#include <string>
#include <map>

struct notes_t{
	double note1,note2,note3,moyenne,coeff,coeff_moy;

	notes_t(){}

	notes_t(
		const double & note1_,
		const double & note2_,
		const double & note3_,
		const double & moyenne_, 
		const double & coeff_,
		const double & coeff_moy_
	):
		note1(note1_),note2(note2_),
		note3(note3_),moyenne(moyenne_),
		coeff(coeff_),coeff_moy(coeff_moy_)
	{}	
};

inline std::ostream & operator << (std::ostream & out,const notes_t & notes){
	out << "[note1 = " << notes.note1 << " note2 = " << notes.note2
		<< " note2 = " << notes.note2 << " moyenne = " << notes.moyenne
		<< " coeff = " << notes.coeff << " coeff_moy = " << notes.coeff_moy << ']';
	return out;
}

typedef unsigned code_t;
typedef std::map<code_t,notes_t> datas_t;

int main(){
	// Ouverture du fichier
	const char *filename = "pouet.txt";
	std::ifstream f(filename);
	if(!f){
		std::cerr << "can't open [" << filename << ']' << std::endl;
		return 1;
	}

	// Lecture du fichier
	datas_t datas;
	{
		std::string line;
		for(unsigned no_line=0;std::getline(f,line);++no_line){
			notes_t notes;
			code_t code;
			if (line.empty() || line[0] == '#') continue;
			if(sscanf(line.c_str()," %i %lf %lf %lf %lf %lf %lf",
				&code,&notes.note1,&notes.note2,&notes.note3,
				&notes.moyenne,&notes.coeff,&notes.coeff_moy) == 7
			){
				std::cout << notes << std::endl;
				datas[code] = notes;
			}else{
				std::cerr << "Ligne " << no_line << " invalide [" 
					<< line << ']' << std::endl;
			}
		}
	}

	// Parcours de la structure data;
	{
		double moy1 = 0, moy2 = 0, moy3 = 0;
		std::size_t nb_notes = datas.size();
		datas_t::const_iterator
			datas_it (datas.begin()),
			datas_end(datas.end());
		for(;datas_it!=datas_end;++datas_it){
			const code_t & code = datas_it->first;
			const notes_t & notes = datas_it->second;
			std::cout << "code = " << code << '\t' << notes << std::endl;
			moy1 += notes.note1;
			moy2 += notes.note2;
			moy3 += notes.note3;
		}
		moy1 /= nb_notes;
		moy2 /= nb_notes;
		moy3 /= nb_notes;
		std::cout << "moy1 = " << moy1 << " moy2 = " << moy2 << " moy3 = " << moy3 << std::endl;
	}

	// Fermeture du fichier
	f.close();
	return 0;
}

[note1 = 11 note2 = 12 note2 = 12 moyenne = 12.8333 coeff = 2 coeff_moy = 25.6667]
[note1 = 11 note2 = 10 note2 = 10 moyenne = 9.66667 coeff = 1 coeff_moy = 9.66667]
[note1 = 14 note2 = 17 note2 = 17 moyenne = 14.1667 coeff = 1 coeff_moy = 14.1667]
[note1 = 10 note2 = 14 note2 = 14 moyenne = 12.1667 coeff = 3 coeff_moy = 36.5]
[note1 = 14 note2 = 17 note2 = 17 moyenne = 16.6667 coeff = 3 coeff_moy = 50]
[note1 = 0 note2 = 15 note2 = 15 moyenne = 7.66667 coeff = 2 coeff_moy = 15.3333]
[note1 = 14 note2 = 15 note2 = 15 moyenne = 15 coeff = 1 coeff_moy = 15]
[note1 = 10 note2 = 10 note2 = 10 moyenne = 10.5 coeff = 1 coeff_moy = 10.5]
[note1 = 11 note2 = 15.5 note2 = 15.5 moyenne = 12.8333 coeff = 1 coeff_moy = 12.8333]
[note1 = 11 note2 = 12 note2 = 12 moyenne = 11.8333 coeff = 1 coeff_moy = 11.8333]
[note1 = 14 note2 = 15 note2 = 15 moyenne = 15.6667 coeff = 1 coeff_moy = 15.6667]
[note1 = 10 note2 = 11 note2 = 11 moyenne = 10.8333 coeff = 1 coeff_moy = 10.8333]
...
moy1 = 10.8333 moy2 = 13.625 moy3 = 13