|
As I recall, the default base ctor is always called first, at least it is if the base class contains instance properties that need initialization.
|
|
|
|
|
CRobert456 wrote: The logic is based on the fact the a base constructor has to be called explicitly, meaning the compiler will not call it automatically That would mean that all objects (!) would inherit the default constructor. That'd be a bit impractical.
You can add code to call an inherited constructor in your class, even if there's a different signature.
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
|
|
|
|
|
First, I have a button that calls 2 functions. First function (calculateMedieSim()) makes an operation with two number and the second one (selectData()) selects data from tabel. totalsim = 15 and totalsimyes = 8. The result should be 53,3 but it shows 0 Why?
private void button1_Click(object sender, EventArgs e)
{
selectData();
calculateMedieSim();
}
private void selectData()
{
string select = "SELECT * FROM accounts WHERE id=1";
using (SQLiteCommand cmd = new SQLiteCommand(select, Conexiune.getConnection()))
{
using (SQLiteDataReader read = cmd.ExecuteReader())
{
if (read.Read())
{
totalsim = (int)read["totalsim"];
totalsimyes = (int)read["totalsimyes"];
}
}
}
}
private void calculateMedieSim()
{
medie_sim = (totalsimyes / totalsim) * 100;
sansa_examen = Math.Round(medie_sim, 2);
Console.WriteLine(sansa_examen);
}
|
|
|
|
|
the only thing I see wrong is (and I presume you've defined the variables this way as well) ...
totalsim = (int)read...
totalsimyes = (int)read...
so, using integer math, whats going to happen when you divide 8 by 15, hmmmm ?
|
|
|
|
|
those 2 variables are defined by int type
|
|
|
|
|
defined by int type ? yes, because you've defined them as such - define them as double for example
|
|
|
|
|
Aaaa yes, there was the problem. Thanks
|
|
|
|
|
If I change code to:
medie_sim = (totalsim / totalsimyes) * 100;
medie_sim = Math.Round(medie_sim, 2);
Console.WriteLine(medie_sim);
I get 100
|
|
|
|
|
how is medie_sim defined ? let me guess - also an Int ?
|
|
|
|
|
|
It's the same problem as your other code - integer division.
15 / 8 = 1.875 , but since the variables are integers, only the integer part is used: 15 / 8 = 1 - You then multiply that result by
100 , which (unsurprisingly) gives a final result of 100 . - You then store that final result in a
double , but it's too late - you've already lost the fractional part at step 1.
You need to convert one of the values to a floating-point type before the division:
medie_sim = ((double)totalsim / totalsimyes) * 100;
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
|
|
|
|
|
May I know how should we extract the individual colour chart from GUI to display the result of RGB, HSI and Lab?
|
|
|
|
|
|
I want to insert an image in database. But if I don't choose any image, I receive : Empty path name is not legal . In database, image field is BLOB and is null. Where is my mistake cause I can't figure it out..I think that I should verify if textBox5 is null and if is, imageBt=null . I tried this but it didn't worked. This is the code that I'm using to insert the image:
byte[] imageBt = null;
FileStream fstream = new FileStream(this.textBox5.Text, FileMode.Open, FileAccess.Read);
BinaryReader br = new BinaryReader(fstream);
imageBt = br.ReadBytes((int)fstream.Length);
SQLiteCommand com = new SQLiteCommand("insert into questions(image) values(@IMG)", Conexiune.getConnection());
com.Parameters.Add(new SQLiteParameter("@IMG", imageBt));
com.ExecuteNonQuery();
|
|
|
|
|
Try this instead of just checking for null:
if (!String.IsNullOrWhiteSpace(textBox5.Text))
{
}
If the brain were so simple we could understand it, we would be so simple we couldn't. — Lyall Watson
|
|
|
|
|
Where should I put this?..
|
|
|
|
|
"Around" your posted code. Or what Pete replied before your posted code (that if (!File.Exists(textBox5.Text)) that he posted also).
If the brain were so simple we could understand it, we would be so simple we couldn't. — Lyall Watson
|
|
|
|
|
Gosh it was so easy..I think I'm tired ) Sorry for this boring question. Thank you!
|
|
|
|
|
Hehe, alright
To cover that topic in a general statement: Always check your inputs before trusting them.
If the brain were so simple we could understand it, we would be so simple we couldn't. — Lyall Watson
|
|
|
|
|
|
First of all, you should name your textboxes with a more meaningful name. Then, you really want to test some validity like this:
if (string.IsNullOrWhitespace(textBox5.Text)) return;
if (!File.Exists(textBox5.Text)) return;
|
|
|
|
|
Where should I put this?..
|
|
|
|
|
Before the point that your code blows up would probably seem a sensible place don't you think?
|
|
|
|
|
I managed to fix it. Gosh it was so easy..I think I'm tired ) Sorry for this boring question. Thank you!
|
|
|
|
|
What are the specific rules to name a C# source file? I came across many posts about this issue but all are about special cases. For example, Microsoft's page about this topic does not really get to the point.
https://msdn.microsoft.com/en-us/library/ms228500%28v=vs.90%29.aspx[^]
I need clear and to-the-point answers. Is a C# source file name arbitrary? I am using code samples from several C# books and the samples tend to pick up the name of the top (non-nested) class in the file or the name of namespace, or maybe something else. I have not tried to play with this yet but my feeling is that the file name could be just arbitrary. Is it correct? What are the imposed restrictions on file name and what are the actual guidelines?
|
|
|
|