When representing a float, why does the exponent face underflow when it hits 2⁻¹²⁶ if 8 bits can hold everything from −127 (incl.) to 128 (incl.)?

CodePudding user response：

Exponents range from −126 to 127 because exponents of −127 (all 0s) and 128 (all 1s) are reserved for special numbers. wikipedia