In this C++ tutorial, you will learn how to find the inverse tangent of a value using atan() function of cmath, with syntax and examples.
C++ atan()
C++ atan() returns inverse tangent of a number in radians.
Syntax
The syntax of C++ atan() is
atan(x)
where
| Parameter | Description |
|---|---|
| x | A double, float, or long double number. |
Returns
The atan() function returns the value in the range of [-π/2, π/2].
The synopsis of atan() function is
double atan(double x); float atan(float x); long double atan(long double x); double atan(T x); // for integral type argument values
Example
In this example, we read x value from the user and find the inverse tangent of this value using atan() function.
C++ Program
#include <iostream>
#include<cmath>
using namespace std;
int main() {
float x;
cout << "Enter a value : ";
cin >> x;
double result = atan(x);
cout << "atan(" << x << ") : " << result << " radians" << endl;
}
Output
Enter a value : 235 atan(235) : 1.56654 radians Program ended with exit code: 0
Enter a value : 0 atan(0) : 0 radians Program ended with exit code: 0
Conclusion
In this C++ Tutorial, we learned the syntax of C++ atan(), and how to use this function to find inverse tangent of a value, with the help of examples.