如何使用 C++ 在函数中添加双精度数？

Question

基本上我在 c++ 中设置了双打，但由于某种原因它给了我这个错误

"..\project2_name.cpp:56:9: error: assignment of function 'double total(double, double, double)'".

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;
}

我有一个开关盒，它可以从一个除了总数之外的菜单中调用它： 案例“3”： cout

    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

total 是函数的名称 - 你不能使用它。使用临时变量或将代码更改为

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