title: c change the exponent of a double
body: <p>Lets say I have a <code>double a = 0.3;</code>. How would I be able to change the exponent of the variable, without using math functions like <code>pow()</code>, or multiplying it manually.</p>
  
  <p>I am guessing I would have to acces the memory addres of the variable using pointers, find the exponent and change it manualy. But how would I accomplish this?</p>
  
  <p>Note, that this is on a 8-bit system, and I am trying to find a faster way to multiply the number by <strong>10^12</strong>, <strong>10^9</strong>, <strong>10^6</strong> or <strong>10^3</strong>.</p>
  
  <p>Best regards!</p>