/*

 * Copyright 2011 Steven Gribble

 *

 *  This file is the solution to an exercise problem posed during

 *  one of the UW CSE 333 lectures (333exercises).

 *

 *  333exercises is free software: you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation, either version 3 of the License, or

 *  (at your option) any later version.

 *

 *  333exercises is distributed in the hope that it will be useful,

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *  GNU General Public License for more details.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with 333exercises.  If not, see <http://www.gnu.org/licenses/>.

 */



#ifndef _COMPLEX_H_

#define _COMPLEX_H_



// Here's our typedef for a Complex number.  We choose to

// expose the type to customers, so that customers can directly

// access fields instead of having to use accessor functions.

//

// A complex number is ((real) + i*(imaginary))

typedef struct {

  double real;

  double imaginary;

} Complex, *ComplexPtr;



// Adds a and b, returns the result.

Complex ComplexAdd(Complex a, Complex b);



// Subtracts b from a, returns the result.

Complex ComplexSubtract(Complex a, Complex b);



// Multplies a times b, returns the result.

Complex ComplexMultiply(Complex a, Complex b);



// Divides a by b, returns the result.  On some

// architectures and compilers, this function

// might cause a divide-by-zero exception to be thrown

// to the OS for some values of b; on other architectures,

// this might cause the fields of the returned complex

// to be set to floating point NAN.

Complex ComplexDivide(Complex a, Complex b);



#endif  // _COMPLEX_H_