我如何使用多条目循环将用户输入的字符串值存储在列表中 c#
[英]how do i store a string value from user input in a list using loop for multiple entry c#
问题描述
编写一个程序来执行以下操作： 创建一个控制台应用程序，要求用户输入奥克兰和惠灵顿两个城市的郊区和邮政编码。 重复这 10 次（这意味着用户必须输入郊区和邮政编码，一个接一个 10 次）。 您需要使用 try 和 catch 块来处理异常。 将郊区的值存储在名为 suburb_values 的列表中，将邮政编码的值存储在名为 postcode_values 的列表中。 您现在需要询问用户是否要 INSERT()、REMOVE() 或 CONTAINS()。 这必须是一个开关盒。 如果用户选择 1：您需要将 5 个预定义的郊区和邮政编码值插入到相应的列表中，并在列表中打印最终值。 如果用户选择 2：您需要使用 Remove() 和 RemoveAt() 删除 4 个值。 如果用户选择 3：您需要检查 suburb_values 列表是否包含用户将输入的至少 5 个郊区。 如果用户选择任何其他值：您需要显示无效并退出。
到目前为止，这是我的代码
using System;
using System.Collections.Generic; // TO HAVE LIST YOU NEED TO ADD THIS LINE using System.Collections.Generic; UNDER the line using System;
namespace Assessent1ListUsingGenerics
{
class Program //List<T> in C# | In Class Activity
{ //a. WAP to insert 10 values of Country and capital names and
//its pin code (two lists: suburb<string> and pincode<int>).
//Print and display the list.
static void Main(string[] args)
{
int counter = 0;
var suburb_values = new List<string>();
while (counter < 10)
{
//creating list suburb_ values ( String Type )
//Adding values to the list from user input //user input will be saved in country_values
Console.WriteLine("PLease Enter a Suburb for Auckland City");
suburb_values.Add(Console.ReadLine()); //suburb_values 1 //this will be the index 2 correct ?
suburb_values.Add(Console.ReadLine()); //suburb_values 2
suburb_values.Add(Console.ReadLine()); //suburb_values 3 country_values.Add(Console.ReadLine()); //country name 1
suburb_values.Add(Console.ReadLine()); //suburb_values 4
suburb_values.Add(Console.ReadLine()); //suburb_values 5
suburb_values.Add(Console.ReadLine()); //suburb_values 6
suburb_values.Add(Console.ReadLine()); //suburb_values 7
suburb_values.Add(Console.ReadLine()); //suburb_values 8
suburb_values.Add(Console.ReadLine()); //suburb_values 9
suburb_values.Add(Console.ReadLine()); //suburb_values 10
counter;
}
//creating list postcode_values ( String Type )
var postcode_values = new List<string>();
Console.WriteLine("Please enter a Post code for the Auckland Suburb you entered ");
//Adding values to the list
postcode_values.Add(Console.ReadLine()); //postcode 1
postcode_values.Add(Console.ReadLine()); //postcode 2
postcode_values.Add(Console.ReadLine()); //postcode 3
postcode_values.Add(Console.ReadLine()); //postcode 4
postcode_values.Add(Console.ReadLine()); //postcode 5
postcode_values.Add(Console.ReadLine()); //postcode 6
postcode_values.Add(Console.ReadLine()); //postcode 7
postcode_values.Add(Console.ReadLine()); //postcode 8
postcode_values.Add(Console.ReadLine()); //postcode 9
postcode_values.Add(Console.ReadLine()); //postcode 10
Console.WriteLine("PLEASE CHOOSE TO INSERT - REMOVE _ CONTAINS \n");
Console.WriteLine("PLEASE SELECT ON OPTION: ");
Console.WriteLine("\nPress 1 for Insert - Press 2 for Remove - Press 3 for Contains ");
int userInput = Convert.ToInt32(Console.ReadLine()); //ASK YOUR INPUT WITH THIS CODE, what user type will be saved inside userInput
switch (userInput)
{
case 1: //you are required to INSERT 5 pre-defined suburb and post code values into the respective lists and print the final values inside the list. ");
{
Console.WriteLine("\nOption 1 Selected - PLEASE INSERT 2 SUBURBS AND 2 POSTCODES FOR AUCKLAND CITY");
//Inserting values to the Suburb list
Console.WriteLine("Please Insert a Suburb ");
suburb_values.Insert(0, Console.ReadLine());
Console.WriteLine("Please Insert the next Suburb ");
suburb_values.Insert(1, Console.ReadLine());
//inserting values to the PostCode list
Console.WriteLine("Please Inser a PostCode");
postcode_values.Insert(0, Console.ReadLine());
Console.WriteLine("Please Inser a PostCode");
postcode_values.Insert(1, Console.ReadLine());
break;
}
case 2:
{
Console.WriteLine("\nOption 2 selected - you are required to REMOVE 4 values using Remove() and RemoveAt().D");
suburb_values.Remove("");
suburb_values.RemoveAt(0);
break;
}
case 3:
{
Console.WriteLine(" you are required to check if the suburb_values list contains atleast 5 suburbs that the user will enter. ");
// code to check missing
break;
}
default:
Console.WriteLine("Invalid");
break;
}
Console.ReadKey();
}
}
1 个解决方案
解决方案1
0 2022-04-07 15:00:07
在这个阶段，我的代码几乎完成了，但是我如何检查 suburb_values 列表是否包含用户将输入的至少 5 个郊区。 ？？？
这是我的代码更新后仍然不确定是否 100% 正确但我正在尝试
使用系统； 使用 System.Collections.Generic； // 要获得列表，您需要使用 System.Collections.Generic 添加此行； 在使用系统的行下；
命名空间 Assessent1ListUsingGenerics {
class Program //列表在C# |
{ //a. insert 10 values of suburb_values and postcode_values
static void Main(string[] args)
{ //------------------------------------ AUCKLAND---------------------------------------------------------------
int counter = 0; // this is for the loop to execute asking user input 10x times for each suburb and postcode values to store in the variables
var suburb_values = new List<string>(); //creating list suburb_ values ( String Type )
var postcode_values = new List<string>(); //creating list postcode_values ( String Type )
try
{
while (counter < 10) //counter is zero and won't pass the limit of 10 times if the user input some value
{
//Adding values to the list from user input //user input will be saved in suburb_values
Console.WriteLine("Please enter a Suburb for Auckland City: ");
suburb_values.Add(Console.ReadLine()); //suburb_values 1 //this will be the index 2 correct ?
//Console.Clear();
Console.WriteLine("Please enter a Post code number: ");
//Adding values to the list
postcode_values.Add(Console.ReadLine()); //postcode 1
// Console.Clear();
counter++;
}
}
catch (FormatException e)
{
Console.WriteLine(e.Message);
}
finally
{
Console.WriteLine(""); //This is Finally block and get executed regardless
}
//--------------FROM HERE SWITCH LOOP FOR AUCKLAND-------------------------------------------------------
Console.WriteLine("\nPLEASE SELECT 1 TO INSERT - 2 TO REMOVE - OR 3 TO CHECK ELEMENTS IN THE LIST CONTAINS \n");
int userInput = Convert.ToInt32(Console.ReadLine()); //ASK YOUR INPUT WITH THIS CODE, what user type will be saved inside userInput
switch (userInput)
{
case 1: //you are required to INSERT 5 pre-defined suburb and post code values into the respective lists and print the final values inside the list. ");
{
try
{
Console.WriteLine("\nOption 1 Selected - PLEASE INSERT 5 SUBURBS AND POSTCODES FOR AUCKLAND AND WELLINGTON CITY");
//Inserting new values to the suburb_values list and postcode list
Console.WriteLine("PLease insert a new Suburb for Auckland City: ");
suburb_values.Insert(0, Console.ReadLine());
//Console.Clear();
//---
Console.WriteLine("Please insert a new PostCode for the Aucland city: ");
postcode_values.Insert(0, Console.ReadLine());
//Console.Clear();
//---
Console.WriteLine("Please insert the next Suburb for Auckland City: ");
suburb_values.Insert(1, Console.ReadLine());
//Console.Clear();
//---
Console.WriteLine("Please Insert the next PostCode for Aucklanf city:");
postcode_values.Insert(1, Console.ReadLine());
//Console.Clear();
//---
Console.WriteLine("Please insert the next Suburb for Auckland City: ");
suburb_values.Insert(2, Console.ReadLine());
//Console.Clear();
//---
Console.WriteLine("Please Insert the next PostCode for Aucklanf city:");
postcode_values.Insert(2, Console.ReadLine());
//Console.Clear();
//---
Console.WriteLine("Please insert the next Suburb for Auckland City: ");
suburb_values.Insert(3, Console.ReadLine());
//Console.Clear();
//---
Console.WriteLine("Please Insert the next PostCode for Aucklanf city:");
postcode_values.Insert(3, Console.ReadLine());
//Console.Clear();
//---
Console.WriteLine("Please insert the next Suburb for Auckland City: ");
suburb_values.Insert(4, Console.ReadLine());
//Console.Clear();
//---
Console.WriteLine("Please Insert the next PostCode for Aucklanf city:");
postcode_values.Insert(4, Console.ReadLine());
//Console.Clear();
}
catch (FormatException e)
{
Console.WriteLine(e.Message);
}
finally
{
Console.WriteLine(""); //This is Finally block and get executed regardless
}
Console.WriteLine("Final Values Inside the Lists: ");
//printing the list
foreach (var add in suburb_values)
Console.Write(add + ": ");
//printing the list
foreach (var add in postcode_values)
Console.WriteLine(add);
break;
}
case 2:
{ //REMOVING THE ELEMENT FROM THE LIST USING AT
Console.WriteLine("\nOption 2 selected - ");
try
{
int removing = 0;
while (removing < 4) //There is 10 positions on the list but here user will remove only 4 //userinput position 0
//userinput position 1
{ //userinput position 2
Console.WriteLine("\nPLEASE ENTER A NUMBER TO DELETE THE SUBURB ON THE LIST\n"); //userinput position 3
suburb_values.RemoveAt(Convert.ToInt32(Console.ReadLine())); //userinput position 4
//userinput position 5
foreach (var sub in suburb_values) //userinput position 6
{ //userinput position 7
Console.WriteLine(sub); //userinput position 8
//removing++; //userinput position 9
}
removing++;
}
}
catch (FormatException e)
{
Console.WriteLine(e.Message);
}
finally
{
Console.WriteLine(""); //This is Finally block and get executed regardless
}
//suburb_values.RemoveAt(0);
break;
}
case 3:
{
Console.WriteLine(" you are required to check if the suburb_values list contains atleast 5 suburbs that the user will enter. ");
// code to check missing
//check list here
Console.WriteLine("Checking List values not index number 8 :{0}", suburb_values.Contains("")); // Cheking is 8 in the pincode list or not.
Console.WriteLine("Checking values Grey Lynn exist in the subrub list :{0}", suburb_values.Contains("Grey Lynn"));
break;
}
default:
Console.WriteLine("Invalid");
break;
}
Console.ReadKey();
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