title: printf how to do floating points with leading zeros
body: <p>I know how to do X amount of leading zeros, and I know how to do X amount of decimal points. But, how do I do them both?</p>
  
  <p>I am looking to have 4 leading zeros to a decimal precision of 2:  0000.00. 
  Therefore 43.4 would be 0043.40</p>