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Visual Basic 4 / 5 / 6 Discussion Thread
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Mar 25th, 2004

Calculate the factorial of a number

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need help with basic program.trying to write a program in qbasic to take in a integer calculate and print out the factorial.been on this for a long time

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zeakman

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Apr 3rd, 2004

Re: Calculate the factorial of a number

could you possibly post the code you have so we can tell exactly what you need help with. that would make it easier to help up thanks

big_k105

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Apr 28th, 2004

Re: Calculate the factorial of a number

I haven't coded in QBasic in years, but in VB it would be like the following:

Visual Basic 4 / 5 / 6 Syntax (Toggle Plain Text)
Dim intNumber As Integer
Dim lngFactorial As Long
Dim lngCounter As Long
 
intNumber = 5
 
For lngCounter = 1 To intNumber
  lngFactorial = lngFactorial * lngCounter
Next lngCounter
Dim intNumber As Integer
Dim lngFactorial As Long
Dim lngCounter As Long
 
intNumber = 5
 
For lngCounter = 1 To intNumber
  lngFactorial = lngFactorial * lngCounter
Next lngCounter

"lngFactorial" would then be your number. Is this what you're looking for?

SleepDepD

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Apr 30th, 2004

Re: Calculate the factorial of a number

If you do not use logarithmus, you will be getting overflow error for factorial of integers larger then approx. 280.
This is VB6 code:
Dim l As Long
Dim res As Double
For l = 1 To total
res = res + Log(CDbl(l))
Next

The final result "res" is used for furhter mathematical operation, rather then directly printing its value val= Exp(res), since if val is too high, you would just get the overflow error.

scisoft

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