need help with c# conditions

Question

what's not ok?

i wanna create a age limit for my console app

what's the problem is with this code?

Answer 1

Hello,

Remove the semi-colon on the if statement, all you need is if (age > 18) no trailing semi-colon.

using System;  
  
namespace ConsoleApp1  
{  
    class Program  
    {  
        static void Main(string[] args)  
        {  
            var input = Console.ReadLine();  
  
            if (int.TryParse(input, out var age))  
            {  
                Console.WriteLine(age > 18 ? $"You are over 18" : "You are not over 18");  
            }  
            else  
            {  
                Console.WriteLine($"Invalid input {input}");  
            }  
        }  
    }  
}  
  

Answer 2

Karen is correct that you need to remove the semicolon. However that is not the cause of the red squiggly line under age > 18. The problem there is that age is a string and age > 18 is comparing the string to a number. You need to convert the string to a number before doing the comparison. If you have questions about the following then please first look at the documentation of TryParse.

string age = Console.ReadLine();
int intage;
if (int.TryParse(age, out intage))
{
    if (intage > 18)
        Console.WriteLine("Over 18");
    else
        Console.WriteLine("17 or under");
}
else
    Console.WriteLine("Invalid response");