# sin() function with example in C++

C++ sin() function: Here, we are going to learn about the sin() function with example of cmath header in C++ programming language?
Submitted by IncludeHelp, on April 27, 2019

## C++ sin() function

sin() function is a library function of cmath header, it is used to find the sine of the given number (angle), it accepts a number (x) and returns the sine of angle x radians.

Syntax of sin() function:

```    sin(x);
```

Parameter(s): x – is the value of an angle in radians whose sine to be calculated.

Return value: double – it returns double type value that is the sine of given angle x radians.

Example:

```    Input:
float x = 2.45;

Function call:
sin(x);

Output:
0.637765
```

### C++ code to demonstrate the example of sin() function

```// C++ code to demonstrate the example of
// sin() function

#include <iostream>
#include <cmath>
using namespace std;

// main() section
int main()
{
float x;

x = -10.23;
cout<<"sin("<<x<<"): "<<sin(x)<<endl;

x = 0;
cout<<"sin("<<x<<"): "<<sin(x)<<endl;

x = 2.45;
cout<<"sin("<<x<<"): "<<sin(x)<<endl;

return 0;
}
```

Output

```sin(-10.23): 0.720984
sin(0): 0
sin(2.45): 0.637765
```

Reference: C++ sin() function