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Visual Studio Code – i want this to make an error message if the user isnt using the right format, but it just displays this

It just displays this instead of the error warning I made:

image

Here is how I want it to be:

image

And here is my code:

Console.Write("Masukkan Tinggi Segitiga: ");
int tinggi = Convert.ToInt32(Console.ReadLine());

if (tinggi > 0)
{
    for (int x = 1; x <= tinggi; x++)
    {
        for (int y = 1; y <= x; y++)
        {
            Console.Write("*");
        }
        Console.WriteLine("");
    }
}
else if (tinggi <= 0)
{
    Console.WriteLine("Input tidak valid! Harus berupa angka & bilangan bulat");
}
Tags:

2

Answers


  1. 0

    The reason why it throws an exception is that you passed in an invalid number string and try to parse it. (i.e. "a" is not a number.)

    Using int.TryParse() and use the returned value to control your condition to output the error message you want:

    Console.WriteLine("=====TP MODUL 3=====");
Console.Write("Masukkan Tinggi Segitiga: ");
var parseResult = int.TryParse(Console.ReadLine(), out var tinggi);

if (!parseResult || tinggi <= 0)
{
    Console.WriteLine("Input tidak valid! Harus berupa angka & bilangan bulat");
}
else
{
    for (int x = 1; x <= tinggi; x++)
    {
        for (int y = 1; y <= x; y++)
        {
            Console.Write("*");
        }
        Console.WriteLine();
    }
}

    Output:

    =====TP MODUL 3=====
Masukkan Tinggi Segitiga: a
Input tidak valid! Harus berupa angka & bilangan bulat
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  2. 0

    you could try:

    if (int.TryParse(input, out tinggi))
{
    ...code here
}
else
{
    Console.WriteLine("something in that language");
}
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