function template

std::abs

<complex>
template<class T> T abs (const complex<T>& x);
Return absolute value of complex
Returns the absolute value of the complex number x.

The absolute value of a complex number is its magnitude (or modulus), defined as the theoretical distance between the coordinates (real,imag) of x and (0,0) (apply pythagorean theorem).

This function is overloaded in <cstdlib> for integral types (see cstdlib abs), in <cmath> for floating-point types (see cmath abs), and in <valarray> for valarrays (see valarray abs).

Parameters

x
Complex value.

Return value

Absolute value of x.
T is x's complex template type (i.e., its value type).

Example

1
2
3
4
5
6
7
8
9
10
11
12
13
// abs complex example
#include <iostream>
#include <complex>
using namespace std;

int main ()
{
  complex<double> mycomplex (3.0,4.0);

  cout << "The absolute value of " << mycomplex << " is " << abs(mycomplex) << endl;

  return 0;
} 


Output:

The absolute value of (3,4) is 5

See also