datagen.cpp

来自「Think in C++文中代码实现」· C++ 代码 · 共 67 行

// File from page 264 in "Thinking in C++" by Bruce Eckel
//////////////////////////////////////////////////
// From the compressed package ECKELT02.ZIP 4/11/95
// (Original ECKELT01.ZIP dated 2/21/95)
// Copyright (c) Bruce Eckel, 1995 
// Source code file from the book "Thinking in C++", 
// Prentice Hall, 1995, ISBN: 0-13-917709-4
// All rights reserved EXCEPT as allowed by the following 
// statements: You may freely use this file for your own 
// work, including modifications and distribution in 
// executable form only. You may copy and distribute this 
// file, as long as it is only distributed in the complete 
// (compressed) package with the other files from this 
// book and you do not remove this copyright and notice. 
// You may not distribute modified versions of the source 
// code in this package. This package may be freely placed 
// on bulletin boards, internet nodes, shareware disks and 
// product vendor disks. You may not use this file in 
// printed media without the express permission of the 
// author. Bruce Eckel makes no 
// representation about the suitability of this software 
// for any purpose. It is provided "as is" without express 
// or implied warranty of any kind. The entire risk as to 
// the quality and performance of the software is with 
// you. Should the software prove defective, you assume 
// the cost of all necessary servicing, repair, or 
// correction. 
// If you think you've found an error, please 
// email all modified files with loudly commented changes 
// to: [e-mail] (please use the same 
// address for non-code errors found in the book).
//////////////////////////////////////////////////

//: DATAGEN.CPP -- Test data generator
#include <fstream.h>
#include <stdlib.h>
#include <string.h>
#include "..\5\datalog.h"

main() {
  ofstream data("data.txt");
  ofstream bindata("data.bin", ios::binary);
  time_t timer = time(NULL);  // Get time
  // Seed random generator:
  srand((unsigned)timer);
  for(int i = 0; i < 100; i++) {
    datapoint d;
    // Convert date/time to a structure:
    d.Time(*localtime(&timer));
    timer += 55; // Reading each 55 seconds
    d.latitude("45*20'31\"");
    d.longitude("22*34'18\"");
    // Zero to 199 meters:
    double newdepth  = rand() % 200;
    double fraction = rand() % 100 + 1;
    newdepth += double(1) / fraction;
    d.depth(newdepth);
    double newtemp = 150 + rand()%200; //Kelvin
    fraction = rand() % 100 + 1;
    newtemp += (double)1 / fraction;
    d.temperature(newtemp);
    d.print(data);
    bindata.write((unsigned char*)&d,
                  sizeof(d));
  }
}