C#

1. 15 / 8 = 1.875, but since the variables are integers, only the integer part is used: 15 / 8 = 1
2. You then multiply that result by 100, which (unsurprisingly) gives a final result of 100.
3. You then store that final result in a double, but it's too late - you've already lost the fractional part at step 1.

medie_sim = ((double)totalsim / totalsimyes) * 100;
// or:
// medie_sim = (totalsim / (double)totalsimyes) * 100;

if (!String.IsNullOrWhiteSpace(textBox5.Text))
{
   // open file etc.
}

if (string.IsNullOrWhitespace(textBox5.Text)) return;
if (!File.Exists(textBox5.Text)) return;

Quote:

Unlike Java, source files can contain more than one top-level public class declaration, and the file name does not need to match any of the classes' names.

CRobert456 wrote:

I have not tried to play with this yet but my feeling is that the file name
could be just arbitrary. Is it correct?

Bastard Programmer from Hell
If you can't read my code, try converting it here[^]

Tuple, Tuple<T>, Tuple<T1, T2>

private Func<bool> AllEmpty;
private Func<bool> AllFull; 
private Func<bool> AnyEmpty;

private Func<bool> CurrentTextBoxTest;

private void Form1_Load(object sender, EventArgs e)
{
    AllEmpty = new Func<bool>(() =>
    {
        return textBox1.Text == string.Empty && textBox2.Text == string.Empty && textBox3.Text == string.Empty;
    });

<pre>
AnyEmpty = new Func<bool>(() =>
{
    return (textBox1.Text == string.Empty || textBox2.Text == string.Empty || textBox3.Text == string.Empty);
});

private void TB_Leave(object sender, EventArgs e)
{
    if(CurrentTextBoxTest != null) button3.Enabled = CurrentTextBoxTest();
}