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C 语言 cos() 函数

❮ 数学函数


示例

返回不同角度的余弦值

const double PI = 3.141592653589793;

printf("%f", cos(3));
printf("%f", cos(-3));
printf("%f", cos(0));
printf("%f", cos(PI));
printf("%f", cos(PI / 2.0));
自己试一试 »

定义和用法

cos() 函数返回一个角度的余弦值。

cos() 函数在 <math.h> 头文件中定义。

注意:角度以弧度为单位。

提示:创建 PI 的常量很方便,这样就可以使用 PI 的分数表示角度。一些 <math.h> 库的实现包含一个常量 M_PI,但不能保证它可用。


语法

以下之一

cos(double angle);

参数值

参数 描述
angle 必需。要查找余弦值的弧度角。

技术细节

返回值 一个 double 值,表示一个角度的余弦值。

❮ 数学函数


相关页面

C 函数教程

C 数学函数教程


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