/C++

# std::conj(std::complex)

Defined in header `<complex>`
(1)
```template< class T >
std::complex<T> conj( const std::complex<T>& z );```
(until C++20)
```template< class T >
constexpr std::complex<T> conj( const std::complex<T>& z );```
(since C++20)
(2)
```std::complex<float> conj( float z );
template< class DoubleOrInteger >
std::complex<double> conj( DoubleOrInteger z );
std::complex<long double> conj( long double z );```
(since C++11)
(until C++20)
```constexpr std::complex<float> conj( float z );
template< class DoubleOrInteger >
constexpr std::complex<double> conj( DoubleOrInteger z );
constexpr std::complex<long double> conj( long double z );```
(since C++20)
1) Computes the complex conjugate of `z` by reversing the sign of the imaginary part.
 2) Additional overloads are provided for `float`, `double`, `long double`, and all integer types, which are treated as complex numbers with zero imaginary component. (since C++11)

### Parameters

 z - complex value

### Return value

The complex conjugate of `z`.

### Example

```#include <iostream>
#include <complex>

int main()
{
std::complex<double> z(1,2);
std::cout << "The conjugate of " << z << " is " << std::conj(z) << '\n'
<< "Their product is " << z*std::conj(z) << '\n';
}```

Output:

```The conjugate of (1,2) is (1,-2)
Their product is (5,0)```