c加加小问题 学生 代码出错

#include
using namespace std;
void save_to_file()
{ofstream outfile("f2.dat");
if(!outfile)
{cerr<<"open f2.dat error!"<<endl;
exit(1);
}
char c[80];
cin.getline(c,80);
for(int i=0;c[i]!=0;i++)
if(c[i]>=65&&c[i]<=90||c[i]>=97&&c[i]<=122)
{outfile.put(c[i]);
cout<<c[i];}
cout<<endl;
outfile.close();
}
void get_from_file()
{char ch;
ifstream infile("f2.dat",ios::in|ios::nocreate);
if(!infile)
{cerr<<"open f2.dat error!"<<endl;
exit(1);
}
ofstream infile("f3.dat");
if(!outfile)
{cerr<<"open f3.dat error!"<<endl;
exit(1);
}
while(infile.get(ch))
{if(ch>=97&&ch<=122)
ch=ch-32;
outfile.put(ch);
cout<<ch;
}
cout<<endl;
infile.close();
outfile.close();
}
int main()
{save_to_file();
get_from_file();
return 0;
}

头文件包含 #include <iostream> 了吗？头文件名不要出错哦