/*
 * File:
 *   complex.h
 * Author:
 *   Samuel A. Rebelsky
 * Version:
 *   1.0 of March 2003
 * Summary:
 *   Type and function declarations for a simple complex type.
 */

#ifndef _COMPLEX_H_
#define _COMPLEX_H_

/* Complex numbers contain a real and imaginary part. */
typedef struct complex {
  double real;
  double imaginary;
} complex;

/*
 * Procedure:
 *   cmult
 * Parameters:
 *   a, a complex number
 *   b, a complex number
 * Purpose:
 *   Multiply a and b.
 * Produces
 *   c, a complex number.
 * Preconditions:
 *   [Standard]
 * Postconditions:
 *   c = a*b
 */
extern complex cmult(complex a, complex b);

#endif /* _COMPLEX_H_ */