Velocity Reviews > multiply(10*12*14)

# multiply(10*12*14)

vips
Guest
Posts: n/a

 05-12-2005
I have a string
str="10*12*14"
now I want the total of this value
i.e. 10 multiply 12 multiply 14
how do i get it ?

is there any function in vb.net to do that ??
if i put it as query to database I get the result, but I want to do it in
the code.

vips

vips
Guest
Posts: n/a

 05-12-2005
thanks Eliyahu ,
I was wondering can i do this in sql query ?
I wrote it previously that it can be done using query, but It was my
mistake.
I mean is there any function in sql server ??

"Eliyahu Goldin" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Parse the string with String.Split() method, convert every substring to
> integer with System.Convert.ToInt32() method (or Int32.Parse()) and

multiply
> the integers.
>
> Eliyahu
>
> "vips" <(E-Mail Removed)> wrote in message
> news:%(E-Mail Removed)...
> > I have a string
> > str="10*12*14"
> > now I want the total of this value
> > i.e. 10 multiply 12 multiply 14
> > how do i get it ?
> >
> > is there any function in vb.net to do that ??
> > if i put it as query to database I get the result, but I want to do it

in
> > the code.
> >
> > vips
> >
> >
> >
> >
> >
> >
> >

>
>

Kevin Spencer
Guest
Posts: n/a

 05-12-2005
> is there any function in vb.net to do that ??

No. However, you CAN use VB.Net to do that. All you have to do is write the
code.

Of course, first you have to analyze the problem. Programming is a
problem-solving process. Remember when you took Algebra in high school, and
they gave you word problems that you had to convert to math problems? Think
of it that way. Analysis is the process of converting a word problem to a
math (programming) problem.

>I have a string
> str="10*12*14"
> now I want the total of this value
> i.e. 10 multiply 12 multiply 14
> how do i get it ?

Okay, first we start with a string. A string has no numbers in it. We want
to parse the string, as it contains text symbols that represent both data
(numbers) and process (math operators). Now, not all text is symbolic of
numbers and math operators, such as the comma for example. So, we first need
to identify what symbols of text we will use as numbers (the easy part -
0,1,2,3,4,5,6,7,8,9), and what symbols of text we will use as operators. I
cannot assume that you are only talking about multiplying numbers here. In
fact, I would guess that you may want to be able to perform all types of
arithmetical computations, IOW adding, subtracting, multiplying, and
dividing. So, for the purpose of this explanation, I'll say that our
operators are +, -, *, and /. Possibly % and \ as well.

Okay, now for the hard part. Your example is good because it contains no
spaces. We can't necessarily assume that there are spaces in the string (you
could, but I can't, since I don't know where your string will come from).
So, we need a means to parse a string into an unknown number of known single
characters, and an unknown number of combinations of 1 or more digit
characters. What is the best programmatic mechanism for doing such complex
string parsing? Offhand, I would say a Regular Expression. So, we have
solved the first part of the problem, which is how to parse the string into
a set of separate strings.

Once we have these separate strings, we must convert the numeric string
expressions to numbers, and the operators to operators, and build a purely
mathematical expression from them. Converting strings to numbers is easy,
and I don't need to explain that. Converting the operators cannot be done
directly, so we need to use selection to identify the operators, in order to
perform math on the numbers. This can be done with a Select Case Statement.

Now we need to know the rules of math, and for arithmentic they are fairly
simple. In this case, the simplicity comes in handy. We know, for example,
that (10*2*4) is equivalent to (10*2) * 4, and is equivalent to 10 * (2*4),
etc. If all we are doing is multiplying, the order of operation is not
important. But, what if we parse 10*2+4? 10*2 = 20. Add 4 and you get 24.
But 10 * (2+4) = 60. So, we're looking for a rule, and we introduce another
possible set of characters that we may need to parse, which is parentheses.
We need to identify whether we will allow the use of parentheses to change
the default rules regarding order of operation, and if so, we need to parse
parentheses, and use them in our math, not directly, but in order to perform
the operations in the correct order. Again, we're talking about selection
here. If there are no parentheses, the default order of operations applies.
If there ARE parentheses, we have to modify the order of operations, as a
program can only perform one operation at a time.

Now that we have analyzed the problem, it's a relatively straightforward
exercise to write the code. And I'll leave that to you!

--
HTH,

Kevin Spencer
Microsoft MVP
..Net Developer
What You Seek Is What You Get.

"vips" <(E-Mail Removed)> wrote in message
news:%(E-Mail Removed)...
>I have a string
> str="10*12*14"
> now I want the total of this value
> i.e. 10 multiply 12 multiply 14
> how do i get it ?
>
> is there any function in vb.net to do that ??
> if i put it as query to database I get the result, but I want to do it in
> the code.
>
> vips
>
>
>
>
>
>
>

Kevin Spencer
Guest
Posts: n/a

 05-12-2005
Thinking it over, as I often do, I have one correction, and one additional
note.

Correction: I should have said 10*12*4, rather than 10*2*4. Same rules, but
sloppy on my part.

Additional note: You MAY need to identify if a string is unparsable, and
handle the exception. MOST strings can NOT be parsed into mathematical
expressions. If, for example, you write a SQL query that is supposed to
perform a mathematical operation, and it can not be parsed, the database
will throw an exception. So, depending upon how you're getting your string
expression, you may need to handle the eventuality that an unparsable string
is entered.

--
HTH,

Kevin Spencer
Microsoft MVP
..Net Developer
What You Seek Is What You Get.

"vips" <(E-Mail Removed)> wrote in message
news:%(E-Mail Removed)...
>I have a string
> str="10*12*14"
> now I want the total of this value
> i.e. 10 multiply 12 multiply 14
> how do i get it ?
>
> is there any function in vb.net to do that ??
> if i put it as query to database I get the result, but I want to do it in
> the code.
>
> vips
>
>
>
>
>
>
>

Eliyahu Goldin
Guest
Posts: n/a

 05-12-2005
Parse the string with String.Split() method, convert every substring to
integer with System.Convert.ToInt32() method (or Int32.Parse()) and multiply
the integers.

Eliyahu

"vips" <(E-Mail Removed)> wrote in message
news:%(E-Mail Removed)...
> I have a string
> str="10*12*14"
> now I want the total of this value
> i.e. 10 multiply 12 multiply 14
> how do i get it ?
>
> is there any function in vb.net to do that ??
> if i put it as query to database I get the result, but I want to do it in
> the code.
>
> vips
>
>
>
>
>
>
>

Kevin Spencer
Guest
Posts: n/a

 05-12-2005
> I mean is there any function in sql server ??

SELECT 10*12*4

--
HTH,

Kevin Spencer
Microsoft MVP
..Net Developer
What You Seek Is What You Get.

"vips" <(E-Mail Removed)> wrote in message
news:eT4V%(E-Mail Removed)...
> thanks Eliyahu ,
> I was wondering can i do this in sql query ?
> I wrote it previously that it can be done using query, but It was my
> mistake.
> I mean is there any function in sql server ??
>
>
> "Eliyahu Goldin" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
>> Parse the string with String.Split() method, convert every substring to
>> integer with System.Convert.ToInt32() method (or Int32.Parse()) and

> multiply
>> the integers.
>>
>> Eliyahu
>>
>> "vips" <(E-Mail Removed)> wrote in message
>> news:%(E-Mail Removed)...
>> > I have a string
>> > str="10*12*14"
>> > now I want the total of this value
>> > i.e. 10 multiply 12 multiply 14
>> > how do i get it ?
>> >
>> > is there any function in vb.net to do that ??
>> > if i put it as query to database I get the result, but I want to do it

> in
>> > the code.
>> >
>> > vips
>> >
>> >
>> >
>> >
>> >
>> >
>> >

>>
>>

>
>

Eliyahu Goldin
Guest
Posts: n/a

 05-12-2005
yes, sure

select 10*12*14

Eliyahu

"vips" <(E-Mail Removed)> wrote in message
news:eT4V%(E-Mail Removed)...
> thanks Eliyahu ,
> I was wondering can i do this in sql query ?
> I wrote it previously that it can be done using query, but It was my
> mistake.
> I mean is there any function in sql server ??
>
>
> "Eliyahu Goldin" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
> > Parse the string with String.Split() method, convert every substring to
> > integer with System.Convert.ToInt32() method (or Int32.Parse()) and

> multiply
> > the integers.
> >
> > Eliyahu
> >
> > "vips" <(E-Mail Removed)> wrote in message
> > news:%(E-Mail Removed)...
> > > I have a string
> > > str="10*12*14"
> > > now I want the total of this value
> > > i.e. 10 multiply 12 multiply 14
> > > how do i get it ?
> > >
> > > is there any function in vb.net to do that ??
> > > if i put it as query to database I get the result, but I want to do it

> in
> > > the code.
> > >
> > > vips
> > >
> > >
> > >
> > >
> > >
> > >
> > >

> >
> >

>
>

vips
Guest
Posts: n/a

 05-12-2005
I actually meant if I am having this string in database in one column
how can I process it ?

"Eliyahu Goldin" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> yes, sure
>
> select 10*12*14
>
> Eliyahu
>
> "vips" <(E-Mail Removed)> wrote in message
> news:eT4V%(E-Mail Removed)...
> > thanks Eliyahu ,
> > I was wondering can i do this in sql query ?
> > I wrote it previously that it can be done using query, but It was my
> > mistake.
> > I mean is there any function in sql server ??
> >
> >
> > "Eliyahu Goldin" <(E-Mail Removed)> wrote in message
> > news:(E-Mail Removed)...
> > > Parse the string with String.Split() method, convert every substring

to
> > > integer with System.Convert.ToInt32() method (or Int32.Parse()) and

> > multiply
> > > the integers.
> > >
> > > Eliyahu
> > >
> > > "vips" <(E-Mail Removed)> wrote in message
> > > news:%(E-Mail Removed)...
> > > > I have a string
> > > > str="10*12*14"
> > > > now I want the total of this value
> > > > i.e. 10 multiply 12 multiply 14
> > > > how do i get it ?
> > > >
> > > > is there any function in vb.net to do that ??
> > > > if i put it as query to database I get the result, but I want to do

it
> > in
> > > > the code.
> > > >
> > > > vips
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> > >

> >
> >

>
>

Kevin Spencer
Guest
Posts: n/a

 05-12-2005
Well, in that case, refer to my first (long) answer. You would have to parse
the string as I described, and use the logic that I described.

--
HTH,

Kevin Spencer
Microsoft MVP
..Net Developer
What You Seek Is What You Get.

"vips" <(E-Mail Removed)> wrote in message
news:eK%(E-Mail Removed)...
>I actually meant if I am having this string in database in one column
> how can I process it ?
>
> "Eliyahu Goldin" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
>> yes, sure
>>
>> select 10*12*14
>>
>> Eliyahu
>>
>> "vips" <(E-Mail Removed)> wrote in message
>> news:eT4V%(E-Mail Removed)...
>> > thanks Eliyahu ,
>> > I was wondering can i do this in sql query ?
>> > I wrote it previously that it can be done using query, but It was my
>> > mistake.
>> > I mean is there any function in sql server ??
>> >
>> >
>> > "Eliyahu Goldin" <(E-Mail Removed)> wrote in message
>> > news:(E-Mail Removed)...
>> > > Parse the string with String.Split() method, convert every substring

> to
>> > > integer with System.Convert.ToInt32() method (or Int32.Parse()) and
>> > multiply
>> > > the integers.
>> > >
>> > > Eliyahu
>> > >
>> > > "vips" <(E-Mail Removed)> wrote in message
>> > > news:%(E-Mail Removed)...
>> > > > I have a string
>> > > > str="10*12*14"
>> > > > now I want the total of this value
>> > > > i.e. 10 multiply 12 multiply 14
>> > > > how do i get it ?
>> > > >
>> > > > is there any function in vb.net to do that ??
>> > > > if i put it as query to database I get the result, but I want to do

> it
>> > in
>> > > > the code.
>> > > >
>> > > > vips
>> > > >
>> > > >
>> > > >
>> > > >
>> > > >
>> > > >
>> > > >
>> > >
>> > >
>> >
>> >

>>
>>

>
>

=?Utf-8?B?U2hhdw==?=
Guest
Posts: n/a

 05-12-2005
I think, you can use “EXEC” command to run a query string in SQL 2000.
Something likes that:

CREATE PROCEDURE MySoredProcedure
AS
DECLARE @lv_SQL VARCHAR(1000)
SET @lv_SQL = 'SELECT’ + ’10*12*4’
EXEC(@lv_SQL)
GO

Shaw

"Kevin Spencer" wrote:

> Thinking it over, as I often do, I have one correction, and one additional
> note.
>
> Correction: I should have said 10*12*4, rather than 10*2*4. Same rules, but
> sloppy on my part.
>
> Additional note: You MAY need to identify if a string is unparsable, and
> handle the exception. MOST strings can NOT be parsed into mathematical
> expressions. If, for example, you write a SQL query that is supposed to
> perform a mathematical operation, and it can not be parsed, the database
> will throw an exception. So, depending upon how you're getting your string
> expression, you may need to handle the eventuality that an unparsable string
> is entered.
>
> --
> HTH,
>
> Kevin Spencer
> Microsoft MVP
> ..Net Developer
> What You Seek Is What You Get.
>
> "vips" <(E-Mail Removed)> wrote in message
> news:%(E-Mail Removed)...
> >I have a string
> > str="10*12*14"
> > now I want the total of this value
> > i.e. 10 multiply 12 multiply 14
> > how do i get it ?
> >
> > is there any function in vb.net to do that ??
> > if i put it as query to database I get the result, but I want to do it in
> > the code.
> >
> > vips
> >
> >
> >
> >
> >
> >
> >

>
>
>

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