Chapter 2, Problem 2.94HW

Following the bit-level floating-point coding rules, implement the function with the following prototype:

/* Compute 2*f. If f is NaN, then return f. */

Float_bits float_twice (float_bits f);

  For floating-point number f, this function computes 2.0 f. If f is NaN, your function should simply return f.

  Test your function by evaluating it for all 2³² values of argument f and comparing the result to what would be obtained using your machine’s floating-point operations