Re: Numer Problem - C# Discussion Boards

Re: You just missed an 'm'

6-Jun-07 20:46

Sir,
I am writing a program that return the current file size in MB
my file size in bytes is 4,412,471 and windows shows it 4.20 MB.

for that I write following code

System.IO.FileInfo objNew = new System.IO.FileInfo("C:\\\\test.rar");
decimal val=objNew.Length / 1048576;
string str = String.Format("{0:F2}", val);

but when i print the str it shows 4.00 what is the problem ...?

I think when (objNew.Length / 1048576) execute it give 4 not 4.2 please give me solution
Sigh | :sigh:

Regards
Pankaj Joshi

You just missed an 'm'

CPallini6-Jun-07 21:07

CPallini

6-Jun-07 21:07

pankaj.indore wrote:
decimal val=objNew.Length / 1048576;

change the above to:

decimal val=objNew.Length / 1048576m;

Try to discover why the avove solves Big Grin | :-D

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

Pankaj - Joshi6-Jun-07 21:47

Re: You just missed an 'm'

6-Jun-07 21:47

It running now... Rose | [Rose]

What is the logic Behind that...? Cry | :((

Regards
Pankaj Joshi

CPallini6-Jun-07 22:06

CPallini

6-Jun-07 22:06

The two operands of the division are both integers hence an integer division is performed, giving 0 as result (the latter is then converted to decimal type, but you've already lost your decimal digits Laugh | :laugh:

). By appending an m you force the compiler to interpeter the operand as a decimal and hence to perform a division between decimals yelding the correct result.

BTW the same chan be obtained explicitely casting one of the operands to decimal type, e.g.:

decimal val= (decimal)objNew.Length / 1048576;

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

Christian Graus6-Jun-07 21:08

Christian Graus

6-Jun-07 21:08

pankaj.indore wrote:
decimal val=objNew.Length / 1048576;

AS the number on the right hand side of the operator is an int, it will return an int. Replace 1048576 with 1048576.00

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Pankaj - Joshi6-Jun-07 21:50

6-Jun-07 21:50

Thx Sir,
its running now... Rose | [Rose]

But what is the actual problem i can't get yet...?

i don't think their is a difference between 1048576.00 and 1048576

please clear it to me.

Regards
Pankaj Joshi

Guffa6-Jun-07 22:02

Guffa

6-Jun-07 22:02

1048576 is a literal of the type int.
1048576.0 is a literal of the type double.

When you do a division where both operands are int, the result is an int.

When you do a division where one or both of the operands are double, the result is a double.

1048576m is a literal of type Decimal. I would suggest that you avoid the Decimal data type, unless you actually need it's higher precision. (Which you don't do in this case.)

---
single minded; short sighted; long gone;

Pankaj - Joshi6-Jun-07 22:20

6-Jun-07 22:20

Thx For your Reply,
I got the actual problem but still have a doubt see code below

Dim d as double
d=5/3
messagebox.show(k.tostring())

result 1.666666667

but in C# it give 1 whyyyyyyyyyyyyyyyy

I know your answer is int/int result int . but my dear friend type casting proves maths wrong...?

universe know this 5/3 = 1.666666....

why C# dosen't...?

Regards
Pankaj Joshi

DavidNohejl6-Jun-07 22:56

DavidNohejl

6-Jun-07 22:56

pankaj.indore wrote:
I know your answer is int/int result int . but my dear friend type casting proves maths wrong...?

universe know this 5/3 = 1.666666....

why C# dosen't...?

I don't remember much VB, but I think equivalent to 5/3 in C# is 5 div 3 in VB. Do you know the difference now?

"Throughout human history, we have been dependent on machines to survive. Fate, it seems, is not without a sense of irony. " - Morpheus
"Real men use mspaint for writing code and notepad for designing graphics." - Anna-Jayne Metcalfe

Colin Angus Mackay6-Jun-07 23:16

Colin Angus Mackay

6-Jun-07 23:16

pankaj.indore wrote:
Dim d as double
d=5/3
messagebox.show(k.tostring())

result 1.666666667

but in C# it give 1 whyyyyyyyyyyyyyyyy

Christian already explained it to you.

5 and 3 are both integers. If you do integer division your result will be an integer.

1.667 is not an integer.

pankaj.indore wrote:
universe know this 5/3 = 1.666666....

Only when it is doing floating point division. When it is doing integer division the result is 1.

Obviously VB performs floating point division, while C# uses integer division (unless told not to, by having the values cast before).

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Guffa7-Jun-07 13:32

Guffa

7-Jun-07 13:32

This VB code:

d = 5 / 3

is equivalent to this C# code:

d = (double)5 / (double)3;

The / operator in VB always does floating point division, converting the operands if needed.

---
single minded; short sighted; long gone;

Tauseef A6-Jun-07 20:45

Tauseef A

6-Jun-07 20:45

actually i m new to dot net

i m using oledb connection

and my query is

"select * from tableabc where name = ? and id = ?"

i dont know how to map these parameters to my command object can any body tell me please

thanks

hello

Re: hi

Sathesh Sakthivel6-Jun-07 20:49

Sathesh Sakthivel

6-Jun-07 20:49

Before posting your questions here in the forum did you read the guidlines of how to post the question in the forum.

pls make your subject with suitable topic relevant to your question.

Don't name your subject as hi, hi all.

pls be specific in your subject and post the questions here.

Regards,

Satips. Rose | [Rose]

Re: hi

blackjack21506-Jun-07 20:55

blackjack2150

6-Jun-07 20:55

Create OleDbParameter objects. Assign them a data type and a value and add them to the collection of parameters of the command object IN THE EXACT ORDER THEY APPEAR IN THE STATEMENT.

Re: hi

Guffa6-Jun-07 22:24

Guffa

6-Jun-07 22:24

In OleDb you use named parameters:

"select * from tableabc where name = @Name and id = @Id"

Use "@Name" and "@Id" as names when you create the parameter objects for the command.

---
single minded; short sighted; long gone;

Get print jobs

blackjack21506-Jun-07 20:36

blackjack2150

6-Jun-07 20:36

Hi.
Is there a way to get the number of the print jobs pending for a specified installed printer?
Thanks.

Re: Get print jobs

Martin#6-Jun-07 22:36

Martin#

6-Jun-07 22:36

Hello,

I think WMI will help you here.

Look at this thread:
http://www.codeproject.com/script/comments/forums.asp?msg=1810670&forumid=1649&XtraIDs=1649&searchkw=printer&sd=9+Mar+2005&ed=7+Jun+2007&author=Martin%23&stype=1#xx1810670xx[^]

Hope it helps!

All the best,

Martin

Re: Get print jobs

blackjack21507-Jun-07 0:31

blackjack2150

7-Jun-07 0:31

Martin# wrote:
Hope it helps!

It sure helped. Thanks a lot!

hi all

Tauseef A6-Jun-07 20:29

Tauseef A

6-Jun-07 20:29

hi all

i am passing two parameters via responce.redirect but its not working can

any body please tell me the exzact syntax

Response.Redirect ("Employee.aspx?id= "+ this.DropDownList1.SelectedValue + "?name=" + this.TextBox1.Text);

hello

Sathesh Sakthivel6-Jun-07 20:41

Sathesh Sakthivel

6-Jun-07 20:41

ghumman63 wrote:
onse.Redirect ("Employee.aspx?id= "+ this.DropDownList1.SelectedValue + "?name=" + this.TextBox1.Text);

Response.Redirect ("Employee.aspx?id= "+ this.DropDownList1.SelectedValue + "&name=" + this.TextBox1.Text);

Regards,

Satips. Rose | [Rose]

M. J. Jaya Chitra6-Jun-07 20:42

M. J. Jaya Chitra

6-Jun-07 20:42

ghumman63 wrote:
Response.Redirect ("Employee.aspx?id= "+ this.DropDownList1.SelectedValue + "?name=" + this.TextBox1.Text);

Use an ampersand (& ) symbol to append the fields after the first one as follows:

Response.Redirect ("Employee.aspx?id= "+ this.DropDownList1.SelectedValue + "&name=" + this.TextBox1.Text);

Best Regards,
M. J. Jaya Chitra

Sathesh Sakthivel6-Jun-07 20:47

Sathesh Sakthivel

6-Jun-07 20:47

Thats what i too have mentioned it.

Regards,

Satips. Rose | [Rose]