title: Parse a file using C++, load the value to a structure
body: <p>I have the following file/line:</p>
  
  <pre><code>pc=1 ct=1 av=112 cv=1100 cp=1700 rec=2 p=10001 g=0 a=0 sz=5 cr=200
  pc=1 ct=1 av=113 cv=1110 cp=1800 rec=2 p=10001 g=0 a=10 sz=5 cr=200
  </code></pre>
  
  <p>and so on. 
  I wish to parse this and take the key value pairs and put them in a structure:</p>
  
  <pre><code>struct pky
  {
      pky() :
        a_id(0),
        sz_id(0),
        cr_id(0),
        cp_id(0),
        cv_id(0),
        ct_id(0),
        fr(0),
        g('U'),
        a(0),
        pc(0),
        p_id(0)
      { }
  };
  </code></pre>
  
  <p>wherein either all the structure fields are used or some might be omitted.</p>
  
  <p>How do I create a C++ class, which will do the same? I am new to C++ and not aware of any functions or library which would do this work.</p>
  
  <p>Each line is to be processed, and the structure will be populated with one line each time and used, before it is flushed. The structure is later used as a parameter to a function.</p>