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What is atan() in C++ ?
Sheza NaveedThe atan() function returns the inverse tangent of a number. Figure 1 shows the C++ representation of the mathematical expression.
To use the atan() function, the cmath header file needs to be included in the program, as shown below:
#include <cmath>
Parameters
It takes a single number as an argument that can be positive, negative, or zero. This value can be a float, double or long double.
Return value
It returns a single value of an angle in radians, ranging from ‘-π/2’ to ‘π/2’. This value can be a float, double, or long double:
double atan(double x);
float atan(float x);
long double atan(long double x);
Example
The following code explains the use of atan() function in C++. It returns the angle value in radians by default. This value can be converted to degrees, as shown:
#include <iostream>
#include <cmath>
using namespace std;
int main() {
double input = 57.6;
double resultRadians = atan(input);
double resultDegrees = (resultRadians * 180) / M_PI;
//M_PI gives the value of Pi in C++ and is defined in the cmath library
cout << "atan(50.6) = " << resultRadians << " radians" << endl;
cout << "atan(50.6) = " << resultDegrees << " degrees" << endl;
return 0;
}RELATED TAGS
c++
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Sheza NaveedCopyright ©2022 Educative, Inc. All rights reserved
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