title: Create a env file containing default values in c++
body: <p>I'm creating a <code>c++</code> project that contains some specific configurations. Those configs can be calibrated depending the scenario.</p>
  <p>As the problem that I trying to solve is a optimization problem and configurations like  <code>BigM</code> and <code>cycles</code> are values that makes difference depending the instance I believe that a configuration file will be a good choice.</p>
  <p>As an example, I actually put in the beginning of my main file, like follow:</p>
  <pre>#define NUM_STABILIZED 1e6
  #define bigM 1e6
  </pre>
  <p>Like <code>.env</code> that is used in <code>node</code> or <code>php</code> projects. There is a default pattern like <code>.env</code> file in <code>c++</code>?</p>
  <p>In a better scenario, I believe that a &quot;like&quot; <code>.env</code> file as follow will be helpful to run massive tests with different approaches:</p>
  <pre>bigM 1e6
  NUM_STABILIZED 1E6
  </pre>
  <p>Just to make easy to run tests without need to every time to recompile the code with different values in those (actual) constants.</p>