如何添加 C# for 循环的结果？答案

【问题标题】：How do you add the results of a C# for-loop?如何添加 C# for 循环的结果？
【发布时间】：2011-03-19 16:35:15
【问题描述】：

我有程序设置询问分钟数和每分钟费用，然后它计算该电话的费用。我有一个 for 循环设置来完成这 3 次。我的问题是如何显示所有 3 次通话的总费用？

这是我的代码：

using System;
using System.Collections.Generic;
using System.Text;


namespace phonecall
{
    class Call
    {
        public
        int callid;  //used with counter in the main()
        int minutes;     //minutes
        double costpermin;  //output for per minute cost
        double pricepercall;    //output for total cost


        public void getdata(int x) //this method gets the data and stores it in the class data members
        {
            callid = ++x;

            Console.WriteLine("Enter the number minutes: ");
            minutes = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter the price per minute: ");
            costpermin = Convert.ToDouble(Console.ReadLine());
            pricepercall = minutes * costpermin;
        }

        public void displaydata() //this method displays the values of the class data members
        {

            Console.WriteLine("Call Number: {0}", callid);
            Console.WriteLine("Number of Minutes: {0}", minutes);
            Console.WriteLine("Cost Per Minute: ${0}", costpermin);
            Console.WriteLine("Total cost of Call: ${0}", pricepercall);
            Console.WriteLine();

        }
    }


    class forloop
    {
        public static void Main()
        {
            Call myCall = new Call(); //instantiation of the Call class

            for (int x = 0; x < 3; x++) //will get the data for 3 calls
            {

                myCall.getdata(x); //calls the object method and takes the value of x to use when getting data from the user
                myCall.displaydata(); //calls the object method to display the data
            }
        }
    }
}

非常感谢任何帮助。

【问题讨论】：

标签： c# object methods for-loop

【解决方案1】：

让您的 getData() 方法返回调用成本：

public double getdata(int x) //this method gets the data and stores it in the class data members
{
  callid = ++x ;
  Console.WriteLine("Enter the number minutes: ");
  minutes = Convert.ToInt32(Console.ReadLine());
  Console.WriteLine("Enter the price per minute: ");
  costpermin = Convert.ToDouble(Console.ReadLine());
  pricepercall = minutes * costpermin;
  return pricePercall; 
}

现在你可以总结一下：

double sumPrices = 0;
for (int x = 0; x < 3; x++) //will get the data for 3 calls
{
   sumPrices+=myCall.getdata(x); //calls the object method and takes the value of x to use when getting data from the user
   myCall.displaydata(); //calls the object method to display the data
}

【讨论】：

【解决方案2】：

    double costforallcalls;

    for(int i = 0; i < 3;i++)
    {
        costforallcalls += minutes * costpercall


    }

【讨论】：

【解决方案3】：

只需在 for 循环中创建一个跟踪您的成本的变量，然后将其写出来

double runningTotal = 0;
for (int x = 0; x < 3; x++) //will get the data for 3 calls
{
    myCall.getdata(x); //calls the object method and takes the value of x to use when getting data from the user
    runningTotal += myCall.pricepercall;
    myCall.displaydata(); //calls the object method to display the data
    Console.WriteLine("Running Total: {0}", runningTotal);
}

或者，您也可以为每个调用创建一个对象并保留周围，然后在需要运行总计时将它们总计

var callList = new List<Call>();
for (int x = 0; x < 3; x++) //will get the data for 3 calls
{
    var myCall = new Call();
    myCall.getdata(x); //calls the object method and takes the value of x to use when getting data from the user
    myCall.displaydata(); //calls the object method to display the data
    callList.Add(myCall);
}


Console.WriteLine("Running Total: ${0}", callList.Sum (c => c.pricepercall));

显然 pricepercall 需要成为公共属性才能执行此操作。

希望这会有所帮助。

【讨论】：