function
cos
<cmath>
double cos ( double x );
float cos ( float x );
long double cos ( long double x );
Compute cosine
Returns the cosine of an angle of
x radians.
In C++, this function is overloaded in
<complex> and
<valarray> (see
complex cos and
valarray cos).
Parameters
- x
- Floating point value representing an angle expressed in radians.
Return Value
Cosine of
x.
Portability
In C, only the
double version of this function exists with this name.
Example
1 2 3 4 5 6 7 8 9 10 11 12 13 14
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/* cos example */
#include <stdio.h>
#include <math.h>
#define PI 3.14159265
int main ()
{
double param, result;
param = 60.0;
result = cos (param*PI/180);
printf ("The cosine of %lf degrees is %lf.\n", param, result );
return 0;
}
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Output:
The cosine of 60.000000 degrees is 0.500000.
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See also
- sin
- Compute sine (function)
- tan
- Compute tangent (function)