Re: [Dev-C++] Complex Number with complex.h and <stdio.h>

[Markella K. <chr...@fr...>]

Here is an example how to use the complex numbers:

// I modified the code from this site:
// http://farside.ph.utexas.edu/teaching/329/lectures/node55.html
// Have fun
// Krisztian


#include <complex.h>
#include <stdio.h>
#include <iostream>
using namespace std;

/* Define complex double data type */
typedef complex<double> dcomp;

int main()
{
  dcomp i, a, b, c, d, e, p, q, r; // Declare complex double variables
  double x, y;

  /* Set complex double variable equal to complex double constant */
  i = dcomp (0.0, 1.0);
  cout << "i = " << i << endl;;
//  printf("\ni = (%6.4f, %6.4f)\n", i);

  /* Test arithmetic operations with complex double variables */
  a = i * i;
  b = 1. / i; 
  cout << "i*i = " << a << endl;
//  printf("\ni*i = (%6.4f, %6.4f)\n", a);
  cout << "1/i = " << b << endl;
//  printf("1/i = (%6.4f, %6.4f)\n", b);

  /* Test mathematical functions using complex double variables */
  c = sqrt(i);
  d = sin(i);
  e = pow(i, 0.25);
  cout << "sqrt(i) = " << c << endl;
//  printf("\nsqrt(i) = (%6.4f, %6.4f)\n", c);
  cout << "sin(i) = " << d << endl;
//  printf("sin(i) = (%6.4f, %6.4f)\n", d);
  cout << "i^0.25 = " << e << endl;
//  printf("i^0.25 = (%6.4f, %6.4f)\n", e);

  /* Test complex operations */
  p = conj(i);
  q = real(i);
  r = imag(i);
  cout << "conj(i) = " << p << endl;
//  printf("\nconj(i) = (%6.4f, %6.4f)\n", p);
  cout << "real(i) = " << q << endl;
//  printf("real(i) = %6.4f\n", q);
  cout << "imag(i) = " << r << endl;
//  printf("imag(i) = %6.4f\n", r);

  cin.get();
  return 0;
}

> Hello all,
>
> Could anyone tell me how to use the complex.h ?
>
> How to enter or declare a complex number and how to perform operation 
> on complex numbers (+, / , * -, arg...) ?
>
> Thank you
>
> Chris
>