C++ sin() Function
Table of Contents
- What is the sin() Function?
- Syntax
- Parameter
- Return Value
- Example of sin() Function in C++
- Conclusion
What is the sin() Function
The sin() function is a math library function that is used to calculate the sine of an angle. This function in C++ can be included using <cmath> header file and it takes a single argument which is the angle in radians. The sin() function is one of the most commonly used trigonometric functions in C++ programming.
Syntax
The syntax for the sin() function is as follows:
The sin() function takes a single argument of type double, float, or long double, and returns the sine of that argument as a value of the same type.
Parameter
Only one argument is required for sin(), and that is the angle in radians.
Return Value
The sin() function returns the sine of the angle in radians. The data type of return value is double.
Example of sin() Function in C++
The following is a simple C++ program that uses the sin() function to calculate the sine of an angle in radians.
#include <cmath> // math library to use the sin() function
using namespace std;
int main() {
double x; // declare a variable to store the angle in radians
cout << "Enter angle (in radians): ";
cin >> x; // prompt user to enter angle
double result = sin(x); // calculate the sine of angle using sin()
cout << "The sine of " << x << " radians is " << result << endl;
return 0;
}
This program starts by including the necessary header files, including <iostream> for input/output and <cmath> for the sin() function. After that, a double variable x is declared to store the angle entered by the user. Here cout is used to prompt the user to enter the angle, and then cin to read the value entered by the user from the keyboard.
Next, the sin() function is defined to calculate the sine of the angle entered by the user and store the result in a double variable named result. At the end of the code, cout will display the result on the console.
Note: The entered angle must be in radians not degrees. If you have an angle in degree, then it must be converted into a radian first.
The program ends with the return statement, which indicates that the program has finished executing and returns a value of 0.
We entered a radian value of 45 degrees which is 0.785398 and the program returned a sin value of 0.785398(45 degrees) in radians.
Conclusion
The sin() function is an essential math library function in C++ programming. It is used to calculate the sine of an angle in radians and is widely used in many applications. Read the article to understand the basics of the sin() function, its syntax, parameter, and return value.
Source: linuxhint.com