C# double is cast as a string-CodePudding

In C# I have the following code and I cant work out why my double values get rendered as a string? When I try to add Tax to Total it reverts to a string?

        double Total = 0;
        double Tax = 0;

        foreach (var Product in ProductList)
        {
            if (Product.Taxable)  Tax = Tax   (Product.Price * .1) ;
            Total = Total   (Product.Price * Product.Qty);
            Console.WriteLine("{0} {1} at {2}", Product.Qty, Product.Item, Product.Price.ToString("C"), Product.Taxable, Product.Exempt);
        }
        Console.WriteLine("Sales Taxes: "   Tax.ToString("C"));            
        Console.WriteLine("Total: "   Total.ToString("C"));
        
        Console.WriteLine("Taxes: "   Total   Tax);

CodePudding user response：

It is because in C# the operator evaluates from left to right:

"Taxes: "   Total   Tax

first it does "Taxes: " Total which makes it a string: "Taxes: 1.23" and then it does: "Taxes: 1.23" Tax which results in "Taxes: 1.232.34" for example.

To fix it calculate the sum before or add brackets:

"Taxes: "   (Total   Tax)

var sum = Total   Tax
"Taxes: "   sum