numberphotos.cpp

Think in C++ 第二版源码

//: C18:NumberPhotos.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// Find the marker "XXX" and replace it with an
// incrementing number whereever it appears. Used
// to help format a web page with photos in it
#include "../require.h"
#include <fstream>
#include <sstream>
#include <iomanip>
#include <string>
using namespace std;

int main(int argc, char* argv[]) {
  requireArgs(argc, 2);
  ifstream in(argv[1]);
  assure(in, argv[1]);
  ofstream out(argv[2]);
  assure(out, argv[2]);
  string line;
  int counter = 1;
  while(getline(in, line)) {
    int xxx = line.find("XXX");
    if(xxx != string::npos) {
      ostringstream cntr;
      cntr << setfill('0') << setw(3) << counter++;
      line.replace(xxx, 3, cntr.str());
    }
    out << line << endl;
  }
} ///:~