title: Warning: this decimal constant is unsigned only in ISO C90
body: <p>Piece of code :</p>
  
  <pre><code>long rangeVar = 0;
  rangeVar = atol(p_value);
  
  if (rangeVar &gt;= -2147483648 &amp;&amp; rangeVar &lt;= 2147483647)
  </code></pre>
  
  <p>On compiling I get: </p>
  
  <blockquote>
    <p>warning: this decimal constant is unsigned only in ISO C90</p>
  </blockquote>
  
  <p>Thanks in Advance</p>