```/*
*
*  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
*  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/>.
*/

#include "complex.h"

Complex ComplexAdd(Complex a, Complex b) {
Complex res;

res.real = a.real + b.real;
res.imaginary = a.imaginary + b.imaginary;
return res;
}

Complex ComplexSubtract(Complex a, Complex b) {
Complex res;

res.real = a.real - b.real;
res.imaginary = a.imaginary - b.imaginary;
return res;
}

Complex ComplexMultiply(Complex a, Complex b) {
Complex res;

res.real = (a.real * b.real) - (a.imaginary * b.imaginary);
res.imaginary = (a.imaginary * b.real) - (a.real * b.imaginary);
return res;
}

Complex ComplexDivide(Complex a, Complex b) {
// This is the hard one.  See Wikipedia for the formula. ;)
Complex res;

res.real =
((a.real * b.real) + (a.imaginary * b.imaginary)) /
((b.real * b.real) + (b.imaginary * b.imaginary));

res.imaginary =
((a.imaginary * b.real) - (a.real * b.imaginary)) /
((b.real * b.real) + (b.imaginary * b.imaginary));

return res;
}
```