How to convert float number to Binary?

Question

Can anyone please tell me how can I convert this float number: 12.25 to binary? I know how to convert the \"12\" but not the 0.25

Any help is much appreciated. Thank

Answer 1

(d means decimal, b means binary)

1. 12.25d is your float.
2. You write 12d in binary and remove it from your float. Only the remainder (.25d) will be left.
3. You write the dot.
4. While the remainder (0.25d) is not zero (and/or you want more digits), multiply it with 2 (-> 0.50d), remove and write the digit left of the dot (0), and continue with the new remainder (.50d).