My visual studio code doesn't sequence programs

Question

I code in C#, when I run code in visual studio code only the first console.WriteLine() statement will actually execute. I code in C# and I just installed visual studio code and the SDK for c#.

Heres the code I executed - a simple program to add 2 numbers

using System;

namespace MyApp 
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Enter number 1: ");
            int num1 = int.Parse(Console.ReadLine());

            Console.WriteLine("Enter number 2: ");
            int num2 = int.Parse(Console.ReadLine());
            
        
        int sum = num1 + num2;
        Console.WriteLine(sum);
        Console.ReadKey();
        
        
        }
    }
}

The output is this:

Enter number 1:

Then when i enter a number it doesn't do anything else, like ask me what number 2 should be.

Are you entering valid integers, and no other characters? Seems to work fine on my machine. Any breakpoints set in the editor? — Jonathan
– Jonathan, Commented Jul 28, 2023 at 10:20
@Jonathan no breakpoints are used and im using integers between 1 and 10 — Jack Walker
– Jack Walker, Commented Jul 28, 2023 at 10:22
Can you change console to a different value (like externalTerminal), and then check again ? — Luuk
– Luuk, Commented Jul 28, 2023 at 10:26
int.Parse will throw an Exception when it fails. (For example enter the text "number" in stead of a number ) — Luuk
– Luuk, Commented Jul 29, 2023 at 11:39

Jonathan · Accepted Answer · 2023-07-28 10:45:58Z

1

The code runs fine on my machine.

Few things to check:

Check if there are any breakpoints set in the editor by accident.
Is the console closing after input or doing anything at all?
Check this answer on another similar question (Use integratedTerminal).
To run the code, use the terminal command dotnet run.

I'd also recommend using a try/catch to check if there's any formatting exceptions appearing. Example:

try
{
    Console.WriteLine("Enter number 1: ");
    int num1 = int.Parse(Console.ReadLine());

    Console.WriteLine("Enter number 2: ");
    int num2 = int.Parse(Console.ReadLine());


    int sum = num1 + num2;
    Console.WriteLine(sum);
    Console.ReadKey();
}
catch(FormatException ex)
{
    Console.WriteLine(ex);
    Console.ReadKey();
}

That way you can tell immediately if there's an error when running the code.

edited Jul 28, 2023 at 10:45

answered Jul 28, 2023 at 10:24

Jonathan

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6 Comments

Jack Walker Over a year ago

each time i execute the program i get this message come up a few times in the debug console, is this normal? Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.

Jonathan Over a year ago

Can you check my updated answer and specifically step 3?

Jack Walker Over a year ago

this generates the same problem as before, my output is still ' enter number 1: ', and then when i enter a number nothing happens

Jonathan Over a year ago

Are you running the code via the terminal command dotnet run or a different way?

Jack Walker Over a year ago

I was using dotnet build, dotnet run works. Sorry I'm new to this, thanks so much for the help.

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