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| M_PI, M_PI_2, M_PI_4, M_1_PI, M_2_PI, M_1_SQRTPI, M_2_SQRTPI - 与 π 相关的常数值 |
与 π 相关的常数值,21 位有效数字
定义:
| 宏定义常数 |
值 |
说明 |
| M_PI |
3.14159265358979323846 |
π |
| M_PI_2 |
1.57079632679489661923 |
π/2 |
| M_PI_4 |
0.785398163397448309616 |
π/4 |
| M_1_PI |
0.318309886183790671538 |
1/π |
| M_2_PI |
0.636619772367581343076 |
2/π |
| M_1_SQRTPI |
0.564189583547756286948 |
1/sqrt(π) |
| M_2_SQRTPI |
1.12837916709551257390 |
2/sqrt(π) |
头文件:
#include <cmath>
命名空间:
无
兼容性:
| 函数 \ C++ Builder 编译器 |
bcc32 |
clang32 |
clang64 |
| M_PI |
√ |
√ |
√ |
| M_PI_2 |
√ |
√ |
√ |
| M_PI_4 |
√ |
√ |
√ |
| M_1_PI |
√ |
√ |
√ |
| M_2_PI |
√ |
√ |
√ |
| M_1_SQRTPI |
√ |
√ |
√ |
| M_2_SQRTPI |
√ |
√ |
√ |
相关链接:
• sin • cos • tan • asin • acos • atan • atan2 • _matherr • 浮点数异常处理
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