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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../ranges/../numeric/math/atan.html below:

std::atan, std::atanf, std::atanl - cppreference.com

(1) float       atan ( float num );

double      atan ( double num );

long double atan ( long double num ); (until C++23)

/*floating-point-type*/
            atan ( /*floating-point-type*/ num );

(since C++23)
(constexpr since C++26)

float       atanf( float num );

(2) (since C++11)
(constexpr since C++26)

long double atanl( long double num );

(3) (since C++11)
(constexpr since C++26) template< /*math-floating-point*/ V >

constexpr /*deduced-simd-t*/<V>

            atan ( const V& v_num ); (S) (since C++26)

template< class Integer >
double      atan ( Integer num );

(A) (constexpr since C++26)

1-3) Computes the principal value of the arc tangent of num. The library provides overloads of std::atan for all cv-unqualified floating-point types as the type of the parameter.(since C++23)

A) Additional overloads are provided for all integer types, which are treated as double.

(since C++11) [edit] Parameters num - floating-point or integer value [edit] Return value

If no errors occur, the arc tangent of

num

(

arctan(num)

) in the range

[- , +]

radians, is returned.

If a range error occurs due to underflow, the correct result (after rounding) is returned.

[edit] Error handling

Errors are reported as specified in math_errhandling.

If the implementation supports IEEE floating-point arithmetic (IEC 60559),

[edit] Notes

POSIX specifies that in case of underflow, num is returned unmodified, and if that is not supported, an implementation-defined value no greater than DBL_MIN, FLT_MIN, and LDBL_MIN is returned.

The additional overloads are not required to be provided exactly as (A). They only need to be sufficient to ensure that for their argument num of integer type, std::atan(num) has the same effect as std::atan(static_cast<double>(num)).

[edit] Example 
#include <cmath>
#include <iostream>
 
int main()
{
    std::cout << "atan(1) = " << std::atan(1) << '\n'
              << "4*atan(1) = " << 4 * std::atan(1) << '\n';
 
    // special values
    std::cout << "atan(Inf) = " << std::atan(INFINITY) << '\n'
              << "2*atan(Inf) = " << 2 * std::atan(INFINITY) << '\n'
              << "atan(-0.0) = " << std::atan(-0.0) << '\n'
              << "atan(+0.0) = " << std::atan(0) << '\n';
}

Output:

atan(1) = 0.785398
4*atan(1) = 3.14159
atan(Inf) = 1.5708
2*atan(Inf) = 3.14159
atan(-0.0) = -0
atan(+0.0) = 0
[edit] See also

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