title: Convert from inches,lbs to centimeter,kg in iOS
body: <p>I have a problem: </p>
  
  <p>My app allow user choose 2 options : <em><code>Metric or Imperial.</code></em> </p>
  
  <ul>
  <li>If user select <code>"Metric", height(cm), weight(kg)</code>.</li>
  <li>If Select <code>"Imperial: height(inch) and weight (lbs)</code>.</li>
  </ul>
  
  <p>I need to change value of height  from inch to centimeter and weight from lbs to kg. </p>
  
  <p><strong>Example :</strong> </p>
  
  <p><code>user input : 70 (inch) and 120 (lbs) ==&gt; convert to 177.8 (cm) and 54.5 (kg)</code></p>
  
  <p>Thanks in advance.</p>