Accumulate Totals

std::accumulate folds a range into one value, such as a total with an optional starting amount.

accumulate_totals.cpp

#include <iostream>
#include <numeric>
#include <vector>

int main() {
    std::vector<int> prices{12, 8, 5};
    int shipping = ;

    int total = std::accumulate(prices.begin(), prices.end(), shipping);

    std::cout << "shipping=" << shipping << std::endl;
    std::cout << "total=" << total << std::endl;
    return 0;
}

#include <iostream>
#include <numeric>
#include <vector>

int main() {
    std::vector<int> prices{12, 8, 5};
    int shipping = ;

    int total = std::accumulate(prices.begin(), prices.end(), shipping);

    std::cout << "shipping=" << shipping << std::endl;
    std::cout << "total=" << total << std::endl;
    return 0;
}

#include <iostream>
#include <numeric>
#include <vector>

int main() {
    std::vector<int> prices{12, 8, 5};
    int shipping = ;

    int total = std::accumulate(prices.begin(), prices.end(), shipping);

    std::cout << "shipping=" << shipping << std::endl;
    std::cout << "total=" << total << std::endl;
    return 0;
}

accumulate `std::accumulate` visits each value in a range and combines it into a running result.

initial value The initial value controls where the total starts before the first element is added.