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std::atan

性病：阿坦

Defined in header ​​
float atan( float arg (1)​
double atan( double arg (2)​
long double atan( long double arg (3)​
double atan( Integral arg (4)(since C++11)

的弧切线的主值。arg...

4%29一组过载或接受任意参数的函数模板积分型等于2%29%28double29%。

参数

arg-value of a floating-point or Integral type

返回值

如果没有错误发生，则将arg范围内28 arg%29%29。[---

π

*。

二

；+

π

*。

二

弧度，返回。

如果由于下流而发生范围错误，则返回舍入%29后的正确结果%28。

错误处理

错误按数学[医]错误处理...

如果实现支持ieee浮点算法%28IEC 60559%29，

  • 如果参数为±0，则返回

  • 如果参数为+∞，则返回+π/2

  • 如果参数为-∞，则返回-π/2

  • 如果参数为nan，则返回nan。

注记

POSIX指定如果是地下水流，arg返回，如果不支持，则实现定义值不大于dbl。[医]敏·弗利特[医]和LDBL[医]民回来了。

实例

二次

#include <iostream>
#include <cmath>
 
int main()
{
    std::cout << "atan(1) = " << atan(1) << " 4*atan(1) = " << 4*atan(1) << '\n';
    // special values
    std::cout << "atan(Inf) = " << atan(INFINITY)
              << " 2*atan(Inf) = " << 2*atan(INFINITY) << '\n'
              << "atan(-0.0) = " << atan(-0.0) << '\n'
              << "atan(+0.0) = " << atan(0) << '\n';
}

二次

产出：

二次

atan(1) = 0.785398 4*atan(1) = 3.14159
atan(Inf) = 1.5708 2*atan(Inf) = 3.14159
atan(-0.0) = -0
atan(+0.0) = 0

二次

另见

asincomputes arc sine (arcsin(x)) (function)
acoscomputes arc cosine (arccos(x)) (function)
atan2arc tangent, using signs to determine quadrants (function)
tancomputes tangent (tan(x)) (function)
atan(std::complex) (C++11)computes arc tangent of a complex number (arctan(z)) (function template)
atan(std::valarray)applies the function std::atan to each element of valarray (function template)

c关于atan的文件

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