cnt_read.cpp

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#ios #include #float

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本文通过一个C++程序示例介绍了如何使用ofstream和ifstream类进行二进制文件的写入与读取操作。该程序首先将浮点数数组写入到文件中，然后清空数组并从文件中重新读取数据，验证了文件读写的正确性。

name="google_ads_frame" marginwidth="0" marginheight="0" src="http://pagead2.googlesyndication.com/pagead/ads?client=ca-pub-5572165936844014&dt=1194442938015&lmt=1194190197&format=336x280_as&output=html&correlator=1194442937843&url=file%3A%2F%2F%2FC%3A%2FDocuments%2520and%2520Settings%2Flhh1%2F%E6%A1%8C%E9%9D%A2%2FCLanguage.htm&color_bg=FFFFFF&color_text=000000&color_link=000000&color_url=FFFFFF&color_border=FFFFFF&ad_type=text&ga_vid=583001034.1194442938&ga_sid=1194442938&ga_hid=1942779085&flash=9&u_h=768&u_w=1024&u_ah=740&u_aw=1024&u_cd=32&u_tz=480&u_java=true" frameborder="0" width="336" scrolling="no" height="280" allowtransparency="allowtransparency"> #include <iostream.h>
#include <fstream.h>

void main(void)
{
float fnum[4] = {99.75, -34.4, 1776.0, 200.1};
int i;

   ofstream out("numbers.asc", ios::out | ios::binary);
   if(!out)
    {
      cout << "Cannot open file.";
      exit (1);
    }
   out.write((unsigned char *) &fnum, sizeof(fnum));
   out.close();
   for (i=0; i<4; i++)
      fnum[i] = 0.0;
   ifstream in("numbers.asc", ios::in | ios::binary);
   if(!in)
    {
      cout << "Cannot open file.";
      exit (1);
    }
   in.read((unsigned char *) &fnum, sizeof(fnum));
   cout << in.gcount() << " bytes read." << endl;
   for (i=0; i<4; i++)
      cout << fnum[i] << " ";
   in.close();
}