In this C++ tutorial, you will learn how to find the sine of an angle using sin() function of cmath, with syntax and examples.
C++ sin()
C++ sin() function returns sine of an angle given in radians. Angle is passed as an argument to sin().
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Syntax
The syntax of C++ sin() is
sin(x)
where
| Parameter | Description |
|---|---|
| x | Angle in radians. |
Returns
Return value depends on the type of value passed for parameter x. The return value of sin(x) is
- double if x is double.
- float if x is float.
- long double if x is long double.
The synopsis of sin() function is
double sin(double x); float sin(float x); long double sin(long double x); double sin(T x); // for integral type argument values
sin() is a function of cmath library. Include cmath library in the program, if using sin().
Example
In this example, we read x value from user and find the sine of this angle using sin() function.
C++ Program
#include <iostream>
#include<cmath>
using namespace std;
int main() {
double x;
cout << "Enter angle (in radians) : ";
cin >> x;
double result = sin(x);
cout << "sin(" << x << ") : " << result << endl;
} Output
Enter angle (in radians) : 1.2 sin(1.2) : 0.932039 Program ended with exit code: 0
Enter angle (in radians) : 0 sin(0) : 0 Program ended with exit code: 0
Conclusion
In this C++ Tutorial, we learned the syntax of C++ sin(), and how to use this function to find sine of given angle, with the help of examples.