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Код

//---------------------------------------------------------------------------
#include <fstream>
#include <iostream>
using namespace std;
//---------------------------------------------------------------------------
int main(int argc, char* argv[])
{
    ifstream  in("file.doc", ios::binary); // входной файл
    {
        if ( ! in )
        {
            cout << "open in error" << endl;
            return 1;
        }
    }

    long  size_old;

    in.clear();
    in.seekg(0, SEEK_END);
    size_old = in.tellg();
    in.close();

    FILE*  fp;
    fp = fopen("file.doc", "r");
{
        if ( ! fp )
        {
            cout << "open in error" << endl;
            return 1;
        }
    }

    fseek(fp, 0, SEEK_END);
    size_old = ftell(fp);
    fclose(fp);

    return 0;
}  
//---------------------------------------------------------------------------