seeking.cpp

来自「This is the second part of that lab manu」· C++ 代码 · 共 26 行

//: C05:Seeking.cpp
// From "Thinking in C++, 2nd Edition, Volume 2"
// by Bruce Eckel & Chuck Allison, (c) 2001 MindView, Inc.
// Available at www.BruceEckel.com.
// Seeking in iostreams
//{L} ../TestSuite/Test
#include "../require.h"
#include <iostream>
#include <fstream>
using namespace std;

int main() {
  ifstream in("Seeking.cpp");
  assure(in, "Seeking.cpp"); // File must already exist
  in.seekg(0, ios::end); // End of file
  streampos sp = in.tellg(); // Size of file
  cout << "file size = " << sp << endl;
  in.seekg(-sp/10, ios::end);
  streampos sp2 = in.tellg();
  in.seekg(0, ios::beg); // Start of file
  cout << in.rdbuf(); // Print whole file
  in.seekg(sp2); // Move to streampos
  // Prints the last 1/10th of the file:
  cout << endl << endl << in.rdbuf() << endl;
} ///:~