ulong vs UInt64

[Sanjib Biswas]

Could anyone point out to me the difference between ulong (C#) and
UInt64/ULong (VB.Net)? I was under the impression that both are same. Below
C# code works fine for a particular value of 'data' (string length 36) and
initial hash value '0' whereas VB.Net code throws an exception in the 8th
iteration, saying the data is either too large or too small for a Uint64. I
am using VB.Net/C# 2005. Am I missing anything here?

C# Code:
=======
static private ulong GetULongHash( string data, ulong hash )
{
hash += ( hash << 13 ) + (ulong)data.Len gth;

for (int i = 0; i < data.Length; i++)
{
hash += (hash << 17) + data[i];
}

return hash;
}

VB.Net Code:
==========

Private Shared Function GetUInt64Hash(B yVal data As String, ByVal hash As
System.UInt64) As System.UInt64

hash += (hash << 13) + CType(data.Leng th, System.UInt64)
Dim i As Integer = 0

While i < data.Length
hash += (hash << 17) + Asc(data(i))
System.Math.Min (System.Threadi ng.Interlocked. Increment(i), i - 1)
End While

Return hash

End Function

[Nicholas Paldino [.NET/C# MVP]]

Re: ulong vs UInt64

Sanjib,

There isn't any difference. ULong and ulong are aliases that the VB.NET
and C# compilers use for UInt64.

My guess for the reason you get the exception is because of differences
in the implicit conversions that VB uses vs the implicit conversions that C#
uses. However, without the inputs, it's impossible to tell.

Also, why are you using the Decrement method on the Interlocked class?
There is really no reason to do this.

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- mvp@spam.guard. caspershouse.co m

"Sanjib Biswas" <sanjib.biswas@ ieee.orgwrote in message
news:%23Naudj4n GHA.4172@TK2MSF TNGP03.phx.gbl. ..

Could anyone point out to me the difference between ulong (C#) and
UInt64/ULong (VB.Net)? I was under the impression that both are same.
Below C# code works fine for a particular value of 'data' (string length
36) and initial hash value '0' whereas VB.Net code throws an exception in
the 8th iteration, saying the data is either too large or too small for a
Uint64. I am using VB.Net/C# 2005. Am I missing anything here?
>
C# Code:
=======
static private ulong GetULongHash( string data, ulong hash )
{
hash += ( hash << 13 ) + (ulong)data.Len gth;
>
for (int i = 0; i < data.Length; i++)
{
hash += (hash << 17) + data[i];
}
>
return hash;
}
>
VB.Net Code:
==========
>
Private Shared Function GetUInt64Hash(B yVal data As String, ByVal hash As
System.UInt64) As System.UInt64
>
hash += (hash << 13) + CType(data.Leng th, System.UInt64)
Dim i As Integer = 0
>
While i < data.Length
hash += (hash << 17) + Asc(data(i))
System.Math.Min (System.Threadi ng.Interlocked. Increment(i), i - 1)
End While
>
Return hash
>
End Function
>
>

[Greg Young]

Re: ulong vs UInt64

VB.NET is complaining that it would have overflowed ..

C# will not error on this by default.

You can turn this off (disable overflow checks).

Cheers,

Greg Young
MVP - C#

http://codebetter.com/blogs/gregyoung

"Sanjib Biswas" <sanjib.biswas@ ieee.orgwrote in message
news:%23Naudj4n GHA.4172@TK2MSF TNGP03.phx.gbl. ..

Could anyone point out to me the difference between ulong (C#) and
UInt64/ULong (VB.Net)? I was under the impression that both are same.
Below C# code works fine for a particular value of 'data' (string length
36) and initial hash value '0' whereas VB.Net code throws an exception in
the 8th iteration, saying the data is either too large or too small for a
Uint64. I am using VB.Net/C# 2005. Am I missing anything here?
>
C# Code:
=======
static private ulong GetULongHash( string data, ulong hash )
{
hash += ( hash << 13 ) + (ulong)data.Len gth;
>
for (int i = 0; i < data.Length; i++)
{
hash += (hash << 17) + data[i];
}
>
return hash;
}
>
VB.Net Code:
==========
>
Private Shared Function GetUInt64Hash(B yVal data As String, ByVal hash As
System.UInt64) As System.UInt64
>
hash += (hash << 13) + CType(data.Leng th, System.UInt64)
Dim i As Integer = 0
>
While i < data.Length
hash += (hash << 17) + Asc(data(i))
System.Math.Min (System.Threadi ng.Interlocked. Increment(i), i - 1)
End While
>
Return hash
>
End Function
>
>

[Sanjib Biswas]

Re: ulong vs UInt64

Hi Nick,

I added few debug statements in both C# and VB.Net code. Please see the
output.

Data : 17\0x01version= "1.0" encoding="utf-8"

VB.Net Code:
============
Length : 36
First Hash : 36
Intermediate Hash : 4718677, 618486431744
data[0] : 49
Intermediate Hash : 618491150476, 810668720751902 72
data[1] : 55
Intermediate Hash : 810674905663407 48, 353537054712791 040
data[2] : 0
Intermediate Hash : 434604545279131 908, 941259211282055 168
data[3] : 120
Intermediate Hash : 137586375656118 7124, 184423540334211 8912
data[4] : 48
Intermediate Hash : 322009915990330 6085, 333268037159419 9040
data[5] : 49
Intermediate Hash : 655277953149750 5243, 551468052428396 9536
data[6] : 118
Intermediate Hash : 120674600557814 74880, 850057523768170 9056
data[7] : 101
<Exceptionin the 8th iteration

C# Code:
========
Length : 36
First Hash : 36
Intermediate Hash : 4718677, 618486431744
data[0] : 49
Intermediate Hash : 618491150476, 810668720751902 72
data[1] : 55
Intermediate Hash : 810674905663407 48, 353537054712791 040
data[2] : 0
Intermediate Hash : 434604545279131 908, 941259211282055 168
data[3] : 120
Intermediate Hash : 137586375656118 7124, 184423540334211 8912
data[4] : 48
Intermediate Hash : 322009915990330 6085, 333268037159419 9040
data[5] : 49
Intermediate Hash : 655277953149750 5243, 551468052428396 9536
data[6] : 118
Intermediate Hash : 120674600557814 74880, 850057523768170 9056
data[7] : 101
Intermediate Hash : 212129121975363 2434, 125560765977484 32896
data[8] : 114
Intermediate Hash : 146773678175020 65445, 179086166090030 77632
data[9] : 115
Intermediate Hash : 141392403527955 91566, 636815639367463 7312
data[10] : 105
Intermediate Hash : 206065267276067 7373, 150871409059594 24000
data[11] : 111
Intermediate Hash : 171477935787201 01483, 740852108195358 3104
data[12] : 110
Intermediate Hash : 610957058696413 3032, 202899075749956 8128
data[13] : 61
Intermediate Hash : 813856134446370 1194, 176429911440016 01536
data[14] : 34
Intermediate Hash : 733480841475575 1163, 174943934188244 17280
data[15] : 49
Intermediate Hash : 638245775987061 6873, 165975903332899 2256
data[16] : 46
Intermediate Hash : 804221679319960 9177, 714291427426605 4656
data[17] : 48
Intermediate Hash : 151851310674656 63867, 156006978937132 15488
data[18] : 34
Intermediate Hash : 123390848874693 27771, 869445196850121 9328
data[19] : 32
Intermediate Hash : 258679278226099 5584, 494748173165448 3968
data[20] : 101
Intermediate Hash : 753427451391547 9662, 443184596261404 6720
data[21] : 110
Intermediate Hash : 119661204765295 26481, 737497659717831 8848
data[22] : 99
Intermediate Hash : 894352999998293 824, 140245714258771 31264
data[23] : 111
Intermediate Hash : 149189244258754 25188, 615681476271118 7456
data[24] : 100
Intermediate Hash : 262899511487706 1133, 246840027173263 7696
data[25] : 105
Intermediate Hash : 509739538660969 8939, 318450802020935 2704
data[26] : 110
Intermediate Hash : 828190340681905 1746, 854157707447605 6576
data[27] : 103
Intermediate Hash : 168234804812951 08383, 340561220064903 168
data[28] : 61
Intermediate Hash : 171640417013600 11585, 157068832636520 36608
data[29] : 34
Intermediate Hash : 144241808913024 96694, 178844143826111 03744
data[30] : 117
Intermediate Hash : 138618512002040 48938, 694971719652553 5232
data[31] : 116
Intermediate Hash : 236482432302003 2656, 161299634012448 3584
data[32] : 102
Intermediate Hash : 397782066314451 6285, 213546035127163 2896
data[33] : 45
Intermediate Hash : 611328101441614 9237, 874679183171924 7872
data[34] : 56
Intermediate Hash : 148600728461353 97143, 310157788834784 8704
data[35] : 34
Returning Hash : 148600728461353 97143

"Nicholas Paldino [.NET/C# MVP]" <mvp@spam.guard .caspershouse.c omwrote in
message news:O4D2Rp4nGH A.3784@TK2MSFTN GP04.phx.gbl...

Sanjib,
>
There isn't any difference. ULong and ulong are aliases that the
VB.NET and C# compilers use for UInt64.
>
My guess for the reason you get the exception is because of differences
in the implicit conversions that VB uses vs the implicit conversions that
C# uses. However, without the inputs, it's impossible to tell.
>
Also, why are you using the Decrement method on the Interlocked class?
There is really no reason to do this.
>
Hope this helps.
>
>
--
- Nicholas Paldino [.NET/C# MVP]
- mvp@spam.guard. caspershouse.co m
>
"Sanjib Biswas" <sanjib.biswas@ ieee.orgwrote in message
news:%23Naudj4n GHA.4172@TK2MSF TNGP03.phx.gbl. ..

>Could anyone point out to me the difference between ulong (C#) and
>UInt64/ULong (VB.Net)? I was under the impression that both are same.
>Below C# code works fine for a particular value of 'data' (string length
>36) and initial hash value '0' whereas VB.Net code throws an exception in
>the 8th iteration, saying the data is either too large or too small for a
>Uint64. I am using VB.Net/C# 2005. Am I missing anything here?
>>
>C# Code:
>=======
>static private ulong GetULongHash( string data, ulong hash )
>{

Console.WriteLi ne("Length : {0}", data.Length);

> hash += ( hash << 13 ) + (ulong)data.Len gth;

Console.WriteLi ne("First Hash : {0}", hash);

>>
> for (int i = 0; i < data.Length; i++)
> {
> hash += (hash << 17) + data[i];

Console.WriteLi ne("Intermediat e Hash : {0}, {1}", hash, (hash <<
17));
Console.WriteLi ne("data[{0}] : {1}", i, (0 + data[i]));

> }

Console.WriteLi ne("Returning Hash : {0}", hash);

> return hash;
>}
>>
>VB.Net Code:
>==========
>>
>Private Shared Function GetUInt64Hash(B yVal data As String, ByVal hash As
>System.UInt6 4) As System.UInt64
>>
> hash += (hash << 13) + CType(data.Leng th, System.UInt64)
> Dim i As Integer = 0
>>
> While i < data.Length
> hash += (hash << 17) + Asc(data(i))
> System.Math.Min (System.Threadi ng.Interlocked. Increment(i), i - 1)
> End While
>>
> Return hash
>>
>End Function
>>
>>

>
>

[Sanjib Biswas]

Re: ulong vs UInt64

Hi Greg,

How do I turn off overflow check in VB.Net? I couldn't find this in the
application properties window.

Regards
Sanjib

"Greg Young" <druckdruckREMO VEgoose@hotmail .comwrote in message
news:e9bWit4nGH A.3320@TK2MSFTN GP04.phx.gbl...

VB.NET is complaining that it would have overflowed ..
>
C# will not error on this by default.
>
You can turn this off (disable overflow checks).
>
Cheers,
>
Greg Young
MVP - C#

http://codebetter.com/blogs/gregyoung

>
"Sanjib Biswas" <sanjib.biswas@ ieee.orgwrote in message
news:%23Naudj4n GHA.4172@TK2MSF TNGP03.phx.gbl. ..

>Could anyone point out to me the difference between ulong (C#) and
>UInt64/ULong (VB.Net)? I was under the impression that both are same.
>Below C# code works fine for a particular value of 'data' (string length
>36) and initial hash value '0' whereas VB.Net code throws an exception in
>the 8th iteration, saying the data is either too large or too small for a
>Uint64. I am using VB.Net/C# 2005. Am I missing anything here?
>>
>C# Code:
>=======
>static private ulong GetULongHash( string data, ulong hash )
>{
> hash += ( hash << 13 ) + (ulong)data.Len gth;
>>
> for (int i = 0; i < data.Length; i++)
> {
> hash += (hash << 17) + data[i];
> }
>>
> return hash;
>}
>>
>VB.Net Code:
>==========
>>
>Private Shared Function GetUInt64Hash(B yVal data As String, ByVal hash As
>System.UInt6 4) As System.UInt64
>>
> hash += (hash << 13) + CType(data.Leng th, System.UInt64)
> Dim i As Integer = 0
>>
> While i < data.Length
> hash += (hash << 17) + Asc(data(i))
> System.Math.Min (System.Threadi ng.Interlocked. Increment(i), i - 1)
> End While
>>
> Return hash
>>
>End Function
>>
>>

>
>

[Jon Skeet [C# MVP]]

Re: ulong vs UInt64

Sanjib Biswas <sanjib.biswas@ ieee.orgwrote:

How do I turn off overflow check in VB.Net? I couldn't find this in the
application properties window.

From MSDN:

<quote>
The Visual Basic compiler supports several optimizations that can, in
some cases, make an application file smaller, make an application run
faster, or speed up the build process, Compiler optimizations are set
in the Advanced Compiler Settings dialog box, accessible from the
Compile page of the Project Designer.

To remove integer overflow checks
With a project selected in Solution Explorer, on the Project menu.
click Properties.

Click the Compile tab.

Click the Advanced Compile Options button.

In the Advanced Compiler Settings dialog box, select the Remove integer
overflow checks check box.
</quote>

(Those are instructions for VS.NET 2005.)

--
Jon Skeet - <skeet@pobox.co m>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

[Greg Young]

Re: ulong vs UInt64

Glad I refreshed! I was just about to post this :)

Thanks Jon!

Cheers,

Greg
"Jon Skeet [C# MVP]" <skeet@pobox.co mwrote in message
news:MPG.1f151c 8c54a34a7998d2b e@msnews.micros oft.com...

Sanjib Biswas <sanjib.biswas@ ieee.orgwrote:

> How do I turn off overflow check in VB.Net? I couldn't find this in
>the
>application properties window.

>
From MSDN:
>
<quote>
The Visual Basic compiler supports several optimizations that can, in
some cases, make an application file smaller, make an application run
faster, or speed up the build process, Compiler optimizations are set
in the Advanced Compiler Settings dialog box, accessible from the
Compile page of the Project Designer.
>
To remove integer overflow checks
With a project selected in Solution Explorer, on the Project menu.
click Properties.
>
Click the Compile tab.
>
Click the Advanced Compile Options button.
>
In the Advanced Compiler Settings dialog box, select the Remove integer
overflow checks check box.
</quote>
>
(Those are instructions for VS.NET 2005.)
>
--
Jon Skeet - <skeet@pobox.co m>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

[Sanjib Biswas]

Re: ulong vs UInt64

Unfortunately, I don't see the Advance Compiler Settings. I checked the help
page also
ms-help://MS.VSExpressCC. v80/MS.NETFramework .v20.en/dv_vsprojopt/html/1f81133a-293f-4dba-bc1c-8baafb01d857.ht m.
I am not sure what's causing VB Express edition to not to show this button.
I am using V8.0.50727.42.

Regards
Sanjib

"Jon Skeet [C# MVP]" <skeet@pobox.co mwrote in message
news:MPG.1f151c 8c54a34a7998d2b e@msnews.micros oft.com...

Sanjib Biswas <sanjib.biswas@ ieee.orgwrote:

> How do I turn off overflow check in VB.Net? I couldn't find this in
>the
>application properties window.

>
From MSDN:
>
<quote>
The Visual Basic compiler supports several optimizations that can, in
some cases, make an application file smaller, make an application run
faster, or speed up the build process, Compiler optimizations are set
in the Advanced Compiler Settings dialog box, accessible from the
Compile page of the Project Designer.
>
To remove integer overflow checks
With a project selected in Solution Explorer, on the Project menu.
click Properties.
>
Click the Compile tab.
>
Click the Advanced Compile Options button.
>
In the Advanced Compiler Settings dialog box, select the Remove integer
overflow checks check box.
</quote>
>
(Those are instructions for VS.NET 2005.)
>
--
Jon Skeet - <skeet@pobox.co m>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

[Greg Young]

Re: ulong vs UInt64

Ah express .. See

http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=141019&SiteID=1

I will c/p here for aggregators.

<QUOTE>
Then add the following line

<RemoveIntegerC hecks>true</RemoveIntegerCh ecks>

in the containers

<PropertyGrou p Condition...Rel ease...">
<PropertyGrou p Condition...Deb ug...">
</QUOTE>

Cheers,

Greg Young
MVP - C#

http://codebetter.com/blogs/gregyoung

"Sanjib Biswas" <sanjib.biswas@ ieee.orgwrote in message
news:OLjOKQ9nGH A.5092@TK2MSFTN GP03.phx.gbl...

Unfortunately, I don't see the Advance Compiler Settings. I checked the
help page also
ms-help://MS.VSExpressCC. v80/MS.NETFramework .v20.en/dv_vsprojopt/html/1f81133a-293f-4dba-bc1c-8baafb01d857.ht m.
I am not sure what's causing VB Express edition to not to show this
button. I am using V8.0.50727.42.
>
Regards
Sanjib
>
"Jon Skeet [C# MVP]" <skeet@pobox.co mwrote in message
news:MPG.1f151c 8c54a34a7998d2b e@msnews.micros oft.com...

>Sanjib Biswas <sanjib.biswas@ ieee.orgwrote:

>> How do I turn off overflow check in VB.Net? I couldn't find this in
>>the
>>application properties window.

>>
>From MSDN:
>>
><quote>
>The Visual Basic compiler supports several optimizations that can, in
>some cases, make an application file smaller, make an application run
>faster, or speed up the build process, Compiler optimizations are set
>in the Advanced Compiler Settings dialog box, accessible from the
>Compile page of the Project Designer.
>>
>To remove integer overflow checks
>With a project selected in Solution Explorer, on the Project menu.
>click Properties.
>>
>Click the Compile tab.
>>
>Click the Advanced Compile Options button.
>>
>In the Advanced Compiler Settings dialog box, select the Remove integer
>overflow checks check box.
></quote>
>>
>(Those are instructions for VS.NET 2005.)
>>
>--
>Jon Skeet - <skeet@pobox.co m>
>http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
>If replying to the group, please do not mail me too

>
>

[Sanjib Biswas]

Re: ulong vs UInt64

Thanks a lot Greg. But my problem remains the same as before. I can see in
the compilation, Vbc is adding /removeintchecks + to remove overflow check
but when I run the application, I get the exception in the same line.

Regards
Sanjib

"Greg Young" <druckdruckREMO VEgoose@hotmail .comwrote in message
news:exmn9S9nGH A.2100@TK2MSFTN GP02.phx.gbl...

Ah express .. See

http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=141019&SiteID=1

>
I will c/p here for aggregators.
>
<QUOTE>
Then add the following line
>
<RemoveIntegerC hecks>true</RemoveIntegerCh ecks>
>
in the containers
>
<PropertyGrou p Condition...Rel ease...">
<PropertyGrou p Condition...Deb ug...">
</QUOTE>
>
Cheers,
>
Greg Young
MVP - C#

http://codebetter.com/blogs/gregyoung

>
"Sanjib Biswas" <sanjib.biswas@ ieee.orgwrote in message
news:OLjOKQ9nGH A.5092@TK2MSFTN GP03.phx.gbl...

>Unfortunatel y, I don't see the Advance Compiler Settings. I checked the
>help page also
>ms-help://MS.VSExpressCC. v80/MS.NETFramework .v20.en/dv_vsprojopt/html/1f81133a-293f-4dba-bc1c-8baafb01d857.ht m.
>I am not sure what's causing VB Express edition to not to show this
>button. I am using V8.0.50727.42.
>>
>Regards
>Sanjib
>>
>"Jon Skeet [C# MVP]" <skeet@pobox.co mwrote in message
>news:MPG.1f151 c8c54a34a7998d2 be@msnews.micro soft.com...

>>Sanjib Biswas <sanjib.biswas@ ieee.orgwrote:
>>> How do I turn off overflow check in VB.Net? I couldn't find this in
>>>the
>>>applicatio n properties window.
>>>
>>From MSDN:
>>>
>><quote>
>>The Visual Basic compiler supports several optimizations that can, in
>>some cases, make an application file smaller, make an application run
>>faster, or speed up the build process, Compiler optimizations are set
>>in the Advanced Compiler Settings dialog box, accessible from the
>>Compile page of the Project Designer.
>>>
>>To remove integer overflow checks
>>With a project selected in Solution Explorer, on the Project menu.
>>click Properties.
>>>
>>Click the Compile tab.
>>>
>>Click the Advanced Compile Options button.
>>>
>>In the Advanced Compiler Settings dialog box, select the Remove integer
>>overflow checks check box.
>></quote>
>>>
>>(Those are instructions for VS.NET 2005.)
>>>
>>--
>>Jon Skeet - <skeet@pobox.co m>
>>http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
>>If replying to the group, please do not mail me too

>>
>>

>
>