CODEWITHSUNDEEP
cvisual-studiocross-platformcomplex-numbers
iAmNotARobotOK
iAmNotARobotOK

Reputation: 1

C: complex numbers in Xcode and VS2015

I've written an application using Xcode (in C), which relies heavily on the use of complex numbers. i.e. :

#include <complex.h>
...

float a, b;
complex float z;
z = a + I * b;

... etc

Now, this notation for complex numbers works great in Xcode, and was the perfect solution when building OS X compatible versions of the application. However, now I have a need to build a Windows version, so I have imported the same code into Visual Studio 2015. But unfortunately, this notation does not work, as VS's implementation of complex numbers is very different. And after researching my issue, I have failed to find any helpful information regarding how to handle complex numbers in such a manner, as to compile successfully on both IDEs.

This is perhaps due to my poor understanding of this C99 standard or maybe it is simply not possible. But, while I feel I could rewrite the C code using VS's own way of handling complex numbers, this would not be ideal, as I now plan to develop the application further for both OSs. And it would take too much time to write two versions of the same code in parallel.

Upvotes: 0

Views: 950

Answers (1)

user3629249
user3629249

Reputation: 16540

as shown in: 'Compiling C code in Visual Studio 2013 with complex.h library'

_Dcomplex dc1 = {3.0, 2.0};

for the variable declaration.

From looking inside VS2013's "complex.h" header, it seems that Microsoft decided on their own implementation for C complex numbers. You'll have to implement your own arithmetical operators using the real() and imag() functions, i.e.:

double real_part = real(dc1) + real(dc2);
double imag_part = imag(dc1) + imag(dc2);
_Dcomplex result = {real_part, imag_part};

I doubt that microsoft has corrected the complex.h header, so you should examine the complex.h header file for the details for the float types

Upvotes: 1

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