# sin Function

Calculates the trigonometric sine function of a double precision floating-point value.

Include

<math.h>

Prototype

double sin (double b);

Argument

 x value for which to return the sine

Return Value

Returns the sine of x specified in radians in the range [-1, 1] . NaN is returned if x is ±∞ .

Example

See the notes at the beginning of this chapter or section for information on using printf() or scanf() (and other functions reading and writing the stdin or stdout streams) in the example code.

#include <math.h>
#include <stdio.h>
#include <errno.h>

int main(void)
{
double x, y;

errno = 0;
x = -1.0;
y = sin (x);
if (errno)
perror("Error");
printf("The sine of %f is %f\n", x, y);

errno = 0;
x = 0.0;
y = sin (x);
if (errno)
perror("Error");
printf("The sine of %f is %f\n", x, y);
}

Example Output

The sine of -1.000000 is -0.841471
The sine of 0.000000 is 0.000000