title: Evaluate Mathematical Function from String
body: <p>Can you give me some ideas about how can I make a simple mathematical expression parser in C?</p>
  
  <p>User enters a mathematical function in a string and from the string I want to create the function in C.
  eg. <code>x + sin(2*x)</code></p>
  
  <p>-> <code>return x + sin(2x);</code></p>
  
  <p>Thanks in advance.</p>