Valarray modulus

[Ben Duncan]

Do valarrays have the modulus operator come with them?

I am just doing question 6 from Project Euler, and I wanted to try out the valarrays.

At the moment, I am testing with:

#include <iostream>
#include <valarray>

int main(){
   int ARRAY[] = {10, 220};
   std::valarray<int> P_Val(H);

   if(P_Val % 10 == 0)
      std::cout << "It Works!" << '\n';
   else
      std::cout << "It doesn't work." << '\n';

   return 0;
}

It doesn't seem to be working at all. g++ complains about the functions that I am making.

Just wondering if any of you had experience with this sort of thing.

Haven't tried vectors yet, either.

I don't want to write a modulus operator, but you guys can. :P

[kev82]

Yes, valarray<int> has % defined (see below), however, it will return another valarray<int> (or one of the intermediate types I've forgotten about), comparing it to zero doesn't make sense.

#include <valarray>
#include <iostream>

int main() {
	std::valarray<int> v(10), q(10);
	for(int i=0;i!=10;++i) v[i] = i;

	q = v % 3;
	
	for(int i=0;i!=10;++i) {
		std::cout << v[i] << "," << q[i] << std::endl;
	}

	return 0;
}

[Ben Duncan]

Thank you very much, kev, you're awesome!