sin() — Calculate Sine

Format

#include <math.h>
double sin(double x);

Language Level

ANSI

Threadsafe

Yes

Description

The sin() function calculates the sine of x, with x expressed in radians. If x is too large, a partial loss of significance in the result may occur.

Return Value

The sin() function returns the value of the sine of x. The value of errno may be set to either EDOM or ERANGE.

Example

This example computes y as the sine of π⁄2. 
#include <math.h>
#include <stdio.h>
 
int main(void)
{
   double pi, x, y;
 
   pi = 3.1415926535;
   x = pi/2;
   y = sin(x);
 
   printf("sin( %lf ) = %lf\n", x, y);
}
/*********************  Output should be similar to: *************
 
sin( 1.570796 ) = 1.000000
*/

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