如何在带有c++的函数中添加双倍？

Question

基本上，我在c++中设置了我的双打，出于某种原因，它给了我这个错误

"..\project2_name.cpp:56:9:错误:函数‘双重总计(双，双，双)’的赋值。“

double appleprice=0;
double pearprice=0;
double tomatoprice=0;
double completetotal=0;


double total(double appleprice, double pearprice, double tomatoprice)
{
    total = appleprice + pearprice + tomatoprice;
        return total;
}

我有一个开关大小写，它是从一个菜单中调用的，除了总菜单: case '3'：cout<< "You a a番茄“<< endl；番茄=productsadd(番茄)；price = 3.02；tomatoprice =addprice(价格)；cout <<”您已经订购了“<< <<”番茄“番茄”<< endl；<

    case '4':
        cout<< "Your Full order" << endl;
        completetotal = total(appleprice, pearprice, tomatoprice);
        cout << "You have on order " << apple << " apples. " << appleprice << " price."<< endl;
        cout << "You have on order " << pear << " pears. " << pearprice << " price."<< endl;
        cout << "You have on order " << tomato << " tomatos. " << tomatoprice << " price."<< endl;
        cout << "You have a total of " << completetotal << endl;
        break;

Answer 1

因为total是函数的名称，所以不能使用它。使用临时变量或可能将代码更改为

double total(double appleprice, double pearprice, double tomatoprice)
{
    return appleprice + pearprice + tomatoprice;
}