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58问答库 > 请问下IEEE754定义的单精度和双精度浮点数表示的范围？

请问下IEEE754定义的单精度和双精度浮点数表示的范围？

2025-03-14 17:42:24

推荐回答（1个）

回答（1）：

你可以用你编译器自带的头文件 FLOAT.H

宏常量名数值
DBL_MAX 1.7976931348623158e+308 double 最大值
DBL_MIN 2.2250738585072014e-308 double 最小值
DBL_EPSILON 2.2204460492503131e-016 double 分辨率
FLT_MAX 3.402823466e+38F float 最大值
FLT_MIN 1.175494351e-38F float 最小值
FLT_EPSILON 1.192092896e-07F float 分辨率

它们按 IEEE754 规定定义。

还有浮点数其它一些参数（宏）也在 FLOAT.H 中。

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