std::acos

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Defined in header <cmath>
float       acos( float arg );
double      acos( double arg );
long double acos( long double arg );
double      acos( Integral arg );
 （C++11 起）
计算反余弦的arg
Original:
Computes arc cosine of arg
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目录

[编辑] 参数

arg -
浮点值
Original:
floating point value
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[编辑] 返回值

arg弧度的范围中以弧度为单位的反余弦[0; π].
Original:
Arc cosine of arg in radians in the range of [0; π] radians.
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域时会出现错误arg范围以外的[-1.0; 1.0]。 NAN是在这种情况下，返回.
Original:
Domain error occurs if arg is outside the range [-1.0; 1.0]. NAN is returned in that case.
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[编辑] 为例

#include <cmath>
#include <iostream>
 
int main()
{
    std::cout << "The number pi is " << std::acos(-1) << '\n';
}

Output: 

The number pi is 3.14159

[编辑] 另请参阅
计算弧的正弦（arcsin(x)）
Original:
computes arc sine (arcsin(x))
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（函数） [edit]
计算反正切值（arctan(x)）
Original:
computes arc tangent (arctan(x))
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（函数） [edit]
圆弧相切，使用标志来确定象限
Original:
arc tangent, using signs to determine quadrants
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（函数） [edit]
计算余弦（cos(x)）
Original:
computes cosine (cos(x))
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（函数） [edit]
（C++11）
计算反余弦值的复数（arccos(z)）
Original:
computes arc cosine of a complex number (arccos(z))
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（函数模板） [edit]
std::acosvalarray的每个元素的功能
Original:
applies the function std::acos to each element of valarray
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（函数模板） [edit]
来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/numeric/math/acos&oldid=29090”