C++ Multiplying elements in a vector

Question

I have been looking for a more optimal solution to the following and I cannot seem to find one.

Let\'s say I have a vector:

std::vector v

Answer 1

You can use a ranged based for loop like:

std::vector vars = {1, 2, 3}
int multi = 1;

for (const auto& e: vars)
    multi *= e;