Hello I am 14 years old trying to learn C language and now scoping out C# and need some help

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what i am doing is trying to ask the user for his/her birth year, month and date and calculate to give correct age

What I have tried:

using System;
namespace age
{
    public class Program
    {

        public static void Main()

        {

            string name;
            int age;
            int birthyear;

            Console.Write("Name: ");
            name = Console.ReadLine();
            Console.Write("Age: ");
            age = Convert.ToInt32(Console.ReadLine());
            Console.Write("Birth Year: ");
            birthyear = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine();
            Console.WriteLine("Name is {0}.", name);
            Console.WriteLine("Age is {0}.", age);
            Console.WriteLine("Birth year is {0}.", birthyear);

        }

    }

}

Posted 25-May-21 16:32pm

Via Gonzales

Updated 25-May-21 21:31pm

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Mohibur Rashid 26-May-21 0:26am

What happened?

Via Gonzales 26-May-21 0:28am

in my current code it only ask for the simple stuff but does not calculate birthdate to age

2 solutions

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OriginalGriff · Answer 1 · 2021-05-25T19:07:00

First off, the way you are doing that is a ad idea - you have no verification at all of the user input, so if I enter "Hello" for my age your app will crash.
DOn't use Convert methods for user input - they always throw an exception if the conversion fails - use the TryParse methods instead.

Secondly, age, is a complication thing: not only does it potentially vary from day to day, but it can have legal implications - what you can't do today without being arrested you may be able to tomorrow, and vice versa. Just asking for a year is not enough!

Thirdly, just getting a year doesn't help much unless you validate it: if I enter "999" or "3" or "99" what should your app do with them?

So instead of that, read the whole birth date from the user and convert it to a DateTime value:

C#

DateTime dob;
while (true)
   {
   Console.Write("Please enter your date of birth: ");
   string inp = Console.ReadLine();
   if (DateTime.TryParse(inp, out dob)) break;
   Console,WriteLine($"\"{inp}\" is not a valid date!");
   }

Then you can use DateTime.Now to work out the Age.

This may help, but I'd suggest you try to get your version working before you go near it: Working with Age: it's not the same as a TimeSpan![^]

Richard MacCutchan · Answer 2 · 2021-05-25T21:31:00

Solution 2

If you are just starting with C# there is an excellent free book you can download from .NET Book Zero by Charles Petzold[^].

Posted 25-May-21 21:31pm

Richard MacCutchan