This function is defined in <cmath> header file.
[Mathematics] sin x = sin(x) [In C++ Programming]
sin() prototype (As of C++ 11 standard)
double sin(double x); float sin(float x); long double sin(long double x); double sin (T x); // For integral type
sin() Parameters
The sin() function takes a single mandatory argument in radians.
sin() Return value
The sin() function returns the value in the range of [-1, 1]. The returned value is either in double
, float
, or long double
.
Example 1: How sin() works in C++?
#include <iostream>
#include <cmath>
using namespace std;
int main()
{
double x = 0.439203, result;
result = sin(x);
cout << "sin(x) = " << result << endl;
double xDegrees = 90.0;
// converting degrees to radians
x = xDegrees*3.14159/180;
result = sin(x);
cout << "sin(x) = " << result << endl;
return 0;
}
When you run the program, the output will be:
sin(x) = 0.425218 sin(x) = 1
Example 2: sin() function with integral type
#include <iostream>
#include <cmath>
using namespace std;
int main()
{
int x = -1;
double result;
result = sin(x);
cout << "sin(x) = " << result << endl;
return 0;
}
When you run the program, the output will be:
sin(x) = -0.841471