title: how Convert char[] of numbers to integer number?
body: <p>Suppose I have:</p>
  
  <pre><code>Operand[2][4] = {{"1", "2", "3", "4"},{"5", "6", "7", "8"}};
  </code></pre>
  
  <p>and I have some bit variables called Operand1_sign and Operand2_sign (0: positive and 1: negative) suppose they are:</p>
  
  <pre><code>Operand1_sign = 0;
  Operand2_sign = 1;
  </code></pre>
  
  <p>How can I convert this into 2 integers and apply some operation on them (such as summation)</p>
  
  <p>i.e.</p>
  
  <pre><code>signed int Operand1, Operand2, Result;
  </code></pre>
  
  <p>so finally I can get the following:</p>
  
  <pre><code>Operand1 = + 1234;
  Operand2 = - 5678;
  Result = Operand1 + Operand2;
  </code></pre>