fig06_12.cpp

// fig06_12.cpp
// Compute the product of an array's elements using accumulate.
#include <array>
#include <fmt/format.h>
#include <iostream>
#include <numeric>

int multiply(int x, int y) {
   return x * y;
}

int main() {
   constexpr std::array integers{1, 2, 3, 4, 5};

   std::cout << fmt::format("Product of integers: {}\n", std::accumulate(
      std::begin(integers), std::end(integers), 1, multiply));

   std::cout << fmt::format("Product of integers with a lambda: {}\n",
      std::accumulate(std::begin(integers), std::end(integers), 1,
         [](const auto& x, const auto& y) {return x * y; }));
}


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