datagen.cpp

来自「C语言数值算法程序大全（第二版）,课本文件」· C++ 代码 · 共 40 行

//: C04:Datagen.cpp
// From "Thinking in C++, 2nd Edition, Volume 2"
// by Bruce Eckel & Chuck Allison, (c) 2003 MindView, Inc.
// Available at www.BruceEckel.com.
// Test data generator
//{L} DataLogger
#include <cstdlib>
#include <cstring>
#include <fstream>
#include "../require.h"
#include "DataLogger.h"
using namespace std;

int main() {
  ofstream data("data.txt");
  assure(data, "data.txt");
  ofstream bindata("data.bin", ios::binary);
  assure(bindata, "data.bin");
  time_t timer;
  Coord lat(45,20,31);
  Coord lon(22,34,18);
  // Seed random number generator:
  srand(time(&timer)); 
  for(int i = 0; i < 100; i++, timer += 55) {
    // Zero to 199 meters:
    double newdepth  = rand() % 200;
    double fraction = rand() % 100 + 1;
    newdepth += 1.0 / fraction;
    double newtemp = 150 + rand()%200; // Kelvin
    fraction = rand() % 100 + 1;
    newtemp += 1.0 / fraction;
    const DataPoint d(timer, Coord(45,20,31), 
                      Coord(22,34,18), newdepth,
                      newtemp);
    data << d << endl;
    bindata.write(reinterpret_cast<const char*>(&d),
                  sizeof(d));
  }
} ///:~