c++ - 需要在 C++ 程序中询问汽车制造商

Question

三辆汽车行驶 500 英里。编写一个程序，输入汽车品牌和每辆汽车使用的燃料加仑数。在为每辆车调用一次 calcMPG() 函数后，主要确定并显示哪辆车最省油以及每加仑行驶了多少英里。calcMPG() 函数应传递行驶距离和用作参数的汽油加仑数，并应返回获得的每加仑英里数。--原始问题，这是我已经完成的，我需要添加汽车的品牌问题，我将在哪里为三辆汽车中的每一辆添加这个问题？

    #include <iostream>
    using namespace std;

     float calcMPG(float distInMiles, float gallon)
    {
    return distInMiles / gallon; //return miles per gallon
     }

    int main()
    {
    // Establish variables 
    float distInMiles = 500;
    float effi_c1, effi_c2, effi_c3, gallons; 

    // Ask for car make and amount of gallons used
    cout << " How many gallons of gas did this car use? ";
    cin >> gallons; 
    effi_c1 = calcMPG(distInMiles, gallons); 

    cout << " How many gallons of gas did this car use? ";
    cin >> gallons; 
    effi_c2 = calcMPG(distInMiles, gallons); 

    cout << " How many gallons of gas did this car use? ";
    cin >> gallons; 
    effi_c3 = calcMPG(distInMiles, gallons);


    // Determine which car is most efficent 
    if (effi_c1 > effi_c2) 
    { 
         if (effi_c1 > effi_c3) 
        {
        cout << "car 1 is most efficient.\n";
        cout << "efficiency (in miles per gallons) : " << effi_c1;
        }
        else 
        {
        cout << "car 3 is most efficient.\n";
        cout << "efficiency (in miles per gallons) : " << effi_c3;
        }
    }
    else 
    {
        if (effi_c2 > effi_c3)
        {
            cout << "car 2 is most efficient.\n";
            cout << "efficiency (in miles per gallons) : " << effi_c2;
        }
        else
        {
            cout << "car 3 is most efficient.\n";
            cout << "efficiency (in miles per gallons) : " << effi_c3;
        }
    }

    return 0;
}

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