C# 标签和转到

Question

这是我的完整程序。显然我是初学者。我面临的问题是，如果年龄小于零，那么它会返回几行，但它也会再次向用户询问 pin。 :( 我能做些什么来解决这个问题？

 using System;

    namespace Examples
    {
        class Program
        {
            static void Main(string[] args)
            {
                string name;
                string city;
                int age;
                int pin;

                // \n is used for line-break
                Console.Write("Enter your name :  ");
                name = Console.ReadLine();

                Console.Write("\nEnter Your City :  ");
                city = Console.ReadLine();

                age:
                Console.Write("\nEnter your age :  ");
                age = Int32.Parse(Console.ReadLine());

                Console.Write("\nEnter your pin :  ");
                pin = Int32.Parse(Console.ReadLine());

                if (age < 0 || age >= 110)
                {
                    goto age;

                }


                // Printing message to console
                //formatting output
                Console.WriteLine("==============");
                Console.WriteLine("Your Complete Address:");
                Console.WriteLine("============\n");

                Console.WriteLine("Name = {0}", name);
                Console.WriteLine("City = {0}", city);
                Console.WriteLine("Age = {0}", age);
                Console.WriteLine("Pin = {0}", pin);
                Console.WriteLine("===============");

                Console.ReadLine();
            }
        }
    }

Answer 1

那么，如果我没理解错的话，你想提示年龄小于 0 或大于 110 吗？

首先，不要使用标签，它们很丑而且你不想使用它们，相反你可以使用 do while 循环，但有很多可能性:

此外，除了使用 \n 语法，您还可以使用 Console.WriteLine

string name;
string city;
int age;
int pin;

// \n is used for line-break
Console.Write("Enter your name :  ");
name = Console.ReadLine();

Console.Write("\nEnter Your City :  ");
city = Console.ReadLine();
age = -1;

while (age < 0 || age >= 110)
{
    Console.Write("\nEnter your age :  ");
    age = Int32.Parse(Console.ReadLine());

    if (age < 0 || age >= 110)
    {
        Console.WriteLine("The age must be between 0 and 110.");
    }
}


Console.Write("\nEnter your pin :  ");
pin = Int32.Parse(Console.ReadLine());


// Printing message to console
//formatting output
Console.WriteLine("==============");
Console.WriteLine("Your Complete Address:");
Console.WriteLine("============\n");

Console.WriteLine("Name = {0}", name);
Console.WriteLine("City = {0}", city);
Console.WriteLine("Age = {0}", age);
Console.WriteLine("Pin = {0}", pin);
Console.WriteLine("===============");

Console.ReadLine();