C++ 学习笔记（2） —— float 和 double 的精度

Size	Range	Precision
4 bytes	±1.18 x 10-38 to ±3.4 x 1038	6-9 significant digits, typically 7
8 bytes	±2.23 x 10-308 to ±1.80 x 10308	15-18 significant digits, typically 16
80-bits (12 bytes)	±3.65 x 10-4951 to ±1.18 x 104932	18-21 significant digits
16 bytes	±3.36 x 10-4932 to ±1.18 x 104932	33-36 significant digits