Dynamic Array, Writing to CSV, Floating Point ?'s

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Re: Dynamic Array, Writing to CSV, Floating Point ?'s

 
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  #21
Aug 9th, 2005
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Originally Posted by Drowzee
C doesn't explicitly support vectors, right? Otherwise, why bother using malloc at all?
No, C doesn't have vectors, which can make this problem a little easier. That's why I asked up front in regard to the design.

[edit]So sticking with that...
C Syntax (Toggle Plain Text) 
  1. #include <iostream>
  2. #include <fstream>
  3. #include <string>
  4. #include <vector>
  5. #include <algorithm>
  6. #include <iterator>
  7. #include <cstdio>
  8.  
  9. struct sRecord
  10. {
  11.    int    date, volume;
  12.    char   time[8];
  13.    double price[4];
  14. };
  15.  
  16. bool operator< (const struct sRecord &a, const struct sRecord &b)
  17. {
  18.    return a.volume < b.volume;
  19. }
  20.  
  21. std::ostream& operator<< (std::ostream &o, struct sRecord &r)
  22. {
  23.    return o << r.date     << ","
  24.             << r.time     << ","
  25.             << r.price[0] << ","
  26.             << r.price[1] << ","
  27.             << r.price[2] << ","
  28.             << r.price[3] << ","
  29.             << r.volume;
  30. }
  31.  
  32. int main(void)
  33. {
  34.    std::vector<sRecord> record;
  35.    const std::string filename("file.csv");
  36.    std::ifstream file(filename.c_str());
  37.    if ( file )
  38.    {
  39.       std::string line;
  40.       while ( file >> line )
  41.       {
  42.          sRecord data;
  43.          if ( std::sscanf(line.c_str(), "%d,%7[^,],%lf,%lf,%lf,%lf,%d",
  44.                           &data.date, &data.time, &data.price[0], &data.price[1],
  45.                           &data.price[2], &data.price[3], &data.volume) == 7 )
  46.          {
  47.             record.push_back(data);
  48.          }
  49.       }
  50.    }
  51.    /*
  52.     * [Modify contents]
  53.     */
  54.    std::sort(record.begin(), record.end());
  55.    std::copy(record.begin(), record.end(),
  56.              std::ostream_iterator<sRecord>(std::cout, "\n"));
  57.    return 0;
  58. }
  59.  
  60. /* file.csv
  61. 20041201,0:00,102.74,102.77,102.74,102.76,5
  62. 20041201,0:05,102.78,102.78,102.75,102.75,3
  63. 20041201,0:10,102.75,102.75,102.7,102.7,7
  64. 20041201,0:15,102.7,102.72,102.7,102.72,8
  65. 20041201,0:20,102.73,102.74,102.73,102.74,2
  66. 20041201,0:25,102.73,102.73,102.7,102.7,4
  67. 20041201,0:30,102.71,102.71,102.68,102.7,10
  68. 20041201,0:35,102.71,102.73,102.68,102.69,15
  69. 20041201,0:40,102.7,102.71,102.69,102.71,12
  70. 20041201,0:45,102.71,102.73,102.71,102.73,2
  71. 20041201,0:50,102.74,102.78,102.74,102.77,12
  72. 20041201,0:55,102.77,102.8,102.77,102.79,17
  73. */
  74.  
  75. /* my output
  76. 20041201,0:20,102.73,102.74,102.73,102.74,2
  77. 20041201,0:45,102.71,102.73,102.71,102.73,2
  78. 20041201,0:05,102.78,102.78,102.75,102.75,3
  79. 20041201,0:25,102.73,102.73,102.7,102.7,4
  80. 20041201,0:00,102.74,102.77,102.74,102.76,5
  81. 20041201,0:10,102.75,102.75,102.7,102.7,7
  82. 20041201,0:15,102.7,102.72,102.7,102.72,8
  83. 20041201,0:30,102.71,102.71,102.68,102.7,10
  84. 20041201,0:40,102.7,102.71,102.69,102.71,12
  85. 20041201,0:50,102.74,102.78,102.74,102.77,12
  86. 20041201,0:35,102.71,102.73,102.68,102.69,15
  87. 20041201,0:55,102.77,102.8,102.77,102.79,17
  88. */
I didn't know what to sort by, so I chose volume.
"One of the methods used by statists to destroy capitalism consists in establishing controls that tie a given industry hand and foot, making it unable to solve its problems, then declaring that freedom has failed and stronger controls are necessary." --Ayn Rand
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Re: Dynamic Array, Writing to CSV, Floating Point ?'s

 
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  #22
Aug 10th, 2005
I'll continue thanking you at this point...

Thank You,

Nolan
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