signed exponent

基本解释

First, eight bits for the exponent should represent -128 to 127, just like a signed byte.
首先，表示指數的 8 位應該是從 -128 到 127，就像帶符號的字節一樣。
The exponent is interpreted as a signed integer, allowing negative as well as positive exponents.
作爲有符號整數的指數可以有正負之分。
A floating literal consists of an integer part, a decimal point, a fraction part, ane or E, an optionally signed integer exponent, and an optional type suffix.
浮點文字量由整數部分，小數點，小數部分，e 或 E，可選的有符號整數指數，以及可選的類型後綴組成。