cppPlaneTankCalculator

#include <iostream>

int main()
{
    const int weightA{500};
    const int weightB{1000};
    const int weightC{1500};
    const int weightD{2000};

    const int consumptionA{ 1 };
    const int consumptionB{ 4 };
    const int consumptionC{ 7 };
    const int consumptionD{ 9 };

    const int tankVolume{ 300 };

    int weight{ 0 };
    int distanceAB{ 0 };
    int distanceBC{ 0 };
    int volumeAB{ 0 };
    int volumeBC{ 0 };
    int neededVolume{ 0 };
    int consumption{ 0 };

    std::cout << "Enter cargo weight\n";
    std::cin >> weight;

    if (weight <= 0) { std::cout << "Incorrect weight! No cargo at all, no need to fly anywhere!\n"; return 0; }
    else if (weight < weightA) { consumption = consumptionA; }
    else if (weight < weightB) { consumption = consumptionB; }
    else if (weight < weightC) { consumption = consumptionC; }
    else if (weight < weightD) { consumption = consumptionD; }
    else { std::cout << "Cargo is too heavy, flight impossible!\n"; return 0; }

    std::cout << "Enter distance from A to B\n";
    std::cin >> distanceAB;
    std::cout << "Enter distance from B to C\n";
    std::cin >> distanceBC;

    volumeAB = distanceAB * consumption;
    volumeBC = distanceBC * consumption;


    if (volumeAB > tankVolume or volumeBC > tankVolume)
    {
        std::cout << "Distance from:\n" <<
            "A to B: " << (volumeAB > tankVolume ? "too long\n" : "good\n") <<
            "B to C: " << (volumeBC > tankVolume ? "too long\n" : "good\n") <<
            "Flight impossible!\n";
        return 0;
    }

    neededVolume = volumeBC - (tankVolume - volumeAB);

    if (neededVolume > 0)
    {
        std::cout << "Need additional " << neededVolume << " liters to tank!\n";
    }
    else
    {
        std::cout << "Do not need additional petrol!\n";
    }

    return 0;
}