operator%

template<class T>
    valarray<T> operator%(const valarray<T>& lhs,
        const valarray<T>& rhs);
template<class T>
    valarray<T> operator%(const valarray<T> lhs, const T& rhs);
template<class T>
    valarray<T> operator%(const T& lhs, const valarray<T>& rhs);

The first template operator returns an object of class valarray<T>, each of whose elements I is x[I] % y[I]. The second template operator stores in element I x[I] % y. The third template operator stores in element I x % y[I].