需要在C++程序中询问汽车制造商

如何解决需要在C++程序中询问汽车制造商

三辆车行驶 500 英里。编写一个程序，输入汽车品牌和每辆车使用的加仑数。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多少英里。 calcMPG() 函数应该传递行驶距离和用作参数的加仑汽油，并且应该返回获得的每加仑英里数。 -- 原来的问题，这是我已经完成的，我需要添加汽车的品牌的问题，我应该在哪里为三辆车中的每一个添加这个问题？

    #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;
}