The sin() function defined in the math.h header file. It helps to return the sine value of given radian value.
double sin(double x) #where x can be in int, float or long double
The sin() function takes a single parameter which is a value representing an angle expressed in radians.
Parameter | Description | Required / Optional |
---|---|---|
double value | A double value indicates angle in radians | Required |
The return value of sin() function is a number between 1 and -1.
Input | Return Value |
---|---|
-1<x ≥ 1 | a number greater than or equal to 0 |
x < -1 | NaN (not a number) |
#include <stdio.h>
#include <math.h>
int main()
{
double v;
double output;
v = 2.3;
output = sin(v);
printf("sin(%.2lf) = %.2lf\n", v, output);
v = -2.3;
output = sin(v);
printf("sin(%.2lf) = %.2lf\n", v, output);
v = 0;
output = sin(v);
printf("sin(%.2lf) = %.2lf\n", v, output);
return 0;
}
Output:
sin(2.30) = 0.75 sin(-2.30) = -0.75 sin(0.00) = 0.00
#include <stdio.h>
#include <math.h>
#define PI 3.14159265
int main () {
double v, out, value;
v = 45.0;
value = PI / 180;
out = sin(v*value);
printf("The sine value of %lf is %lf degrees", v, out);
return(0);
}
Output:
The sine value of 45.000000 degrees is 0.707107