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Ios

#include <fstream> #include <iostream> #include <cstdlib> using namespace std; void print_error(const char* p1, const char* p2 = 0); int main(int argc, char* argv[]) {       if (3 != argc)         print_error("usage: function input_file output_file");      ifstream in(argv[1], ios::binary | ios::ate);                           if (!in) print_error("cannot open input file", argv[1]);      long N = in.tellg();                                                    char buffer[N];                                                         in.seekg(ios::beg);                                                     ofstream out(argv[2], ios::binary);                                     if (!out) print_error("cannot open output file", argv[2]);      in.read(buffer, N);                                                     out.write(buffer, N);                                                   if (!in.good()) {         print_error("something strange happened");         exit(1);      }      in.close();      out.close();      return 0; } void print_error(const char* p1, const char* p2) {      if (p2)          cerr << p1 << ' ' << p2 << endl;      else          cerr << p1 << endl;      exit(1); }