新手求助，内附代码
#include <iostream>
#include <cstdlib>
#include <list>
#include <functional>
#include <algorithm>
#include <string>
#include <fstream>
using namespace std;
class student
{
private:
double math;
double english;
double sum;
fstream c1;
public:
student(){}
void setstudent(double m,double e)
{
math=m;
english=e;
}
double getsum()
{
sum=math+english;
return sum;
}
void display()
{
cout<<math<<" "<<english<<" "<<getsum()<<endl;
}
char *Filename(string &file);
void printStudent(string &file);
};
void student::printStudent(string &file)
{
c1.clear();
c1.open(Filename(file),fstream::out | fstream::app);
if(!c1)
{
cerr<<"Can not open file."<<endl;
system("pause");
exit(1);
}
c1<<math<<" "<<english
<<" "<<getsum()<<endl;
c1.clear();
c1.close();
}
char* student::Filename(string &file)
{
char *cp;
cp=new char[file.size()+1];
char *txt=".txt";
strcpy(cp,file.c_str());
strcat(cp,txt);
return cp;
delete cp;
}
class Lstudent
{
private:
list<student> L;
public:
void list_add(student &_s)
{
L.push_back(_s);
}
static bool cmp_sum(student &_s1,student &_s2)
{
return _s1.getsum() > _s2.getsum();
}
void list_sort()
{
L.sort(cmp_sum);
}
static void L_display(student &_s)
{
_s.display();
}
void LL_display()
{
for_each(L.begin(),L.end(),L_display);
}
void L_print(string &file)
{
list<student>::iterator it;
for(it=L.begin();it!=L.end();++it)
(*it).printStudent(file);//调用函数
system("pause");
}
};
int main()
{
student s1;
Lstudent l1;
string filename("0012");
s1.setstudent(35.5,50.5);
l1.list_add(s1);
s1.setstudent(50.2,85.6);
l1.list_add(s1);
s1.setstudent(12,30);
l1.list_add(s1);
l1.list_sort();
l1.LL_display();
l1.L_print(filename);
system("pause");
return 0;
}
在Dev-c++ 4.9.9.2中提示Build error。
应该是文件流函数出现的问题，但不知道怎么改，各位能不能帮帮忙。。
[解决办法]
