获取用户输入，原料和价格，并返回最便宜和最昂贵的

Question

我对C#完全陌生，遇到了一个我找不到解决方案的问题。

任务是为一道菜写下三种配料，然后给出它们的价格。然后，程序是找到最便宜和最昂贵的原料，并返回一条信息，说：

“你选择了第一种原料，价格最便宜”

“你选择了第二种原料，价格最贵”

我下面写的代码只显示没有相关成分的价格。有人知道怎么解决这个问题吗？

谢谢您抽时间见我!

    static void Main(string[] args)
    {

        int counter = 0;
        int price = 0;
        int largest = 0;
        int lowest = 0;
        string ingredient;

        for (counter = 0; counter < 3; counter++)
        {
            Console.WriteLine("Please select an ingredient");
            ingredient = Console.ReadLine();
        }

        for (counter = 0; counter < 3; counter++)
        {


            Console.WriteLine("What is the price for it?");
            price = Convert.ToInt32(Console.ReadLine());

            if (counter == 0)
            {
                largest = price;
            }
            else
            {
                if (price > largest)
                    largest = price;
            }

            if (counter == 0)
            {
                lowest = price;
            }
            else
            {
                if (price < lowest)
                    lowest = price;
            }
        }
        Console.WriteLine("The most expensive ingredient costs {0} $", largest);
        Console.WriteLine("The cheapest ingredient costs {0} $", lowest);
        Console.ReadLine();
    }
}

}

Answer 1

在面向对象的编程中，我们把一切都看作是object.在您的场景中，您必须将ingredient看作具有Name和Price两个属性的对象。这样，对商业的理解就变得非常简单了。我重写了你的例子。

试试下面的代码：

using System;
using System.Collections.Generic;
using System.Linq; 

class Program
{
    static void Main(string[] args)
    {           
        var ingredients = new List<Ingredient>();

        Console.WriteLine("Please enter count of ingredient:");
        var countOfIngredient = int.Parse(Console.ReadLine());


        for (var i = 0; i < countOfIngredient; i++)
        {
            Console.WriteLine("-----------------------------------------");

            Console.WriteLine($"Please enter name of ingredient-{i}:");
            var name = Console.ReadLine();

            Console.WriteLine($"Please enter price of ingredient-{i}:");
            var price= double.Parse(Console.ReadLine());

            ingredients.Add(new Ingredient { Name = name, Price = price });
        }

        var cheapestIngredient = ingredients.OrderBy(i => i.Price).First();
        var mostExpensiveIngredient= ingredients.OrderByDescending(i => i.Price).First();

        Console.WriteLine("-----------------------------------------");
        Console.WriteLine("-----------------------------------------");

        Console.WriteLine($"The most expensive ingredient is {mostExpensiveIngredient.Name} with price of {mostExpensiveIngredient.Price} $");
        Console.WriteLine($"The cheapest ingredient is {cheapestIngredient.Name} with price of {cheapestIngredient.Price} $");

        Console.ReadLine();
    }
}

class Ingredient
{
    public string Name { get; set; }
    public double Price { get; set; }
}

完全可以自由地问问题。祝好运