读入字符存入磁盘文件

#include <iostream>
#include <fstream>
/* run this program using the console pauser or add your own getch, system("pause") or input loop */
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 outfile("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(int argc, char** argv) {
    save_to_file();
    get_from_file();
    return 0;
}