如果所有位都为0，那么IEEE浮点值是多少？

Question

If all bits are 0 (example I memset the floating point variable to all 0), what is the value of IEEE floating point used in gcc? It is guaranteed to be 0.0 ?

I guess for other floating point formats result may vary. But my question is specific to IEEE floating point used with gcc.

Answer 1

If the implementation is IEEE 754 compliant there exist special cases for different bit-combinations, like documented here .

For your case: When all bits (sign, exponent, mantissa) are zero the floating point value represents also zero, as defined by IEEE 754.