cos, cosl

Remonter à Math.h - Index

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

 #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		+	+	+