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cos, cosl

Header File

math.h

Category

Math Routines, Inline Routines

Prototype

double cos(double x);

long double cosl(long double x);

Description

Calculates the cosine of a value.

cos computes the cosine of the input value. The angle is specified in radians.

cosl is the long double version; it takes a long double argument and returns a long double result.

Return Value

cos of a real argument returns a value in the range -1 to 1. Error handling for these functions can be modified through _matherr (or _matherrl).

Example

Copy Code

    #include <stdio.h>
    #include <math.h>
    int main(void)
    {
       double result;
       double x = 0.5;
       result = cos(x);
       printf("The cosine of %lf is %lf\n", x, result);
       return 0;
    }

Portability

| POSIX | Win32 | ANSI C | ANSI C++
cos | + | + | + | +
cosl |  | + | + | +

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