cake.cpp

#include <benri/cmath.h>
#include <benri/si/si.h>
#include <iostream>

int main()
{
    using namespace benri::si;    // Import si literals.
    using namespace benri::casts; // Import casts into namespace for ADL to work.

    // set size of the cake
    auto height   = 4_centi * metre;
    auto diameter = 30_centi * metre;

    // calculate volume
    auto volume = height * constant::pi * square(diameter / 2.0);

    // set density of the batter
    auto density = 1_gram / cubic(centi * metre);

    // calculate the mass of the cake
    auto mass = density * volume;

    // print the recipe
    std::cout << "  vanilla cake  \n"
              << "----------------\n"
              << ceil(mass * 0.028).value() << " gram butter\n"
              << ceil(mass * 0.099).value() << " gram sugar\n"
              << ceil(mass * 0.0635).value() << " gram flour\n"
              << ceil(mass / 2828.0).value() << " pack of backing soda\n"
              << floor(mass * 0.002).value() << " eggs\n"
              << ceil(mass * 0.1765).value() << " gram quark cream\n"
              << ceil(mass * 0.0705).value() << " gram oil\n"
              << ceil(mass / 2828.0).value() << " pack of vanille aroma\n"
              << ceil(mass / 2828.0).value() << "/2 litre milk\n"
              << std::flush;
}