title: When I change a parameter inside a function, does it change for the caller, too?
body: <p>I have written a function below:</p>
  
  <pre><code>void trans(double x,double y,double theta,double m,double n)
  {
      m=cos(theta)*x+sin(theta)*y;
      n=-sin(theta)*x+cos(theta)*y;
  }
  </code></pre>
  
  <p>If I call them in the same file by </p>
  
  <pre><code>trans(center_x,center_y,angle,xc,yc);
  </code></pre>
  
  <p>will the value of <code>xc</code> and <code>yc</code> change? If not, what should I do?</p>