Real constant with mantissa?

Question

How to calculate the mantissa like 616e-5 how i can calculate and make in arithemrthic number?

Answer 1

Do you speak about the mantissa in the binary representation of floating point numbers ? If yes, only applying a mask and a binary shift can give it to you. If you also want other parts (exponent, sign), you just need to do the same with another mask and another shift ^^