Convert String to int in C#

Question

I am trying to write a simple program that asks the user to enter a number and then I will use that number to decide what the cost of the ticket will be for their given age.

Answer 1

I suggest to use the Int32.TryParse() method. Further I suggest to refactor your code - you can make it much cleaner (assuming this is not just example code). One solution is to use a key value pair list to map from age to admission.

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

static class TicketPrice
{
    private static readonly IList> AgeAdmissionMap =
        new List>
            {
                new KeyValuePair(0, "FREE!"),
                new KeyValuePair(5, "$5."),
                new KeyValuePair(18, "$10."),
                new KeyValuePair(56, "$8.")
            };

    public static void Main(String[] args)
    {
        Console.WriteLine("Please Enter Your Age!");

        UInt32 age;  
        while (!UInt32.TryParse(Console.ReadLine(), out age)) { }

        String admission = TicketPrice.AgeAdmissionMap
            .OrderByDescending(pair => pair.Key)
            .First(pair => pair.Key <= age)
            .Value;

        Console.WriteLine(String.Format(
            "You are {0} and the admission is {1}",
            age,
            admission));
    }
}

I used an unsigned integer to prevent entering negative ages and put the input into a loop. This way the user can correct an invalid input.