binio.cpp

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// binio.cpp
// binary input and output with integers

#include <fstream>                     //for file streams
#include <iostream>
using namespace std;
const int MAX = 100;                   //size of buffer
int buff[MAX];                         //buffer for integers

int main()
   {
   for(int j=0; j<MAX; j++)            //fill buffer with data
      buff[j] = j;                     //(0, 1, 2, ...)
                                       //create output stream
   ofstream os("edata.dat", ios::binary);
                                       //write to it
   os.write( reinterpret_cast<char*>(buff), MAX*sizeof(int) );
   os.close();                         //must close it

   for(j=0; j<MAX; j++)                //erase buffer
      buff[j] = 0;
                                       //create input stream
   ifstream is("edata.dat", ios::binary);
                                       //read from it
   is.read( reinterpret_cast<char*>(buff), MAX*sizeof(int) );

   for(j=0; j<MAX; j++)                //check data
      if( buff[j] != j )
         { cerr << "Data is incorrect\n"; return 1; }
   cout << "Data is correct\n";
   return 0;
   }