C++ 文件处理

/**************

文本文件信息写入

***************/

#include <iostream.h>

#include <fstream.h>

void main()

{

      ofstream outfile("d:\\a.txt",ios::out);

      if(! outfile) cerr<<"打开文件错误\n";

      else

      {

            outfile<<"姓名\t"<<"英语\t"<<"计算机\t"<<endl;

            outfile<<"罗志勇\t"<<"85.5\t"<<"98\t"<<endl;

            outfile<<"Lzy\t"<<"80\t"<<"93.5\t"<<endl;

            outfile.close();

      }   

}

/**************

文本文件信息读出

***************/

#include <iostream.h>

#include <fstream.h>

#include <stdlib.h>

void main()

{

      char s[256];

      fstream infile("d:\\a.txt",ios::in);

      if(! infile)

      {

            cerr<<"打开文件错误\n";

            abort();

      }

      infile.getline(s,256);

      cout<<s<<endl;

      while(! infile.eof())       //是否到文件结尾

      {

            infile.getline(s,256);

            cout<<s<<endl;

      }

      infile.close();

}

/**************

文本文件拷贝

***************/

#include <iostream.h>

#include <fstream.h>

#include <stdlib.h>

void main()

{

      fstream infile("d:\\a.txt",ios::in);

      if(! infile)

      {

            cerr<<"打开a文件错误\n";

            abort();

      }

      fstream outfile("d:\\b.txt",ios::out);

      if(! outfile)

      {

            cerr<<"打开b文件错误\n";

            abort();

      }

      char ch;

      while(infile.get(ch));  //没成功

      outfile.put(ch);

      infile.close();

      outfile.close();

}