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DecToFrac - Converts a decimal number into a fraction
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| Total Hit (1730) |
«Code LangId=1»' Converts a decimal value into fractional parts as integers
' (based on the concept of Continued Fractions)
' Examples of usage:
' Call DeclToFrac(0.125, a, b) ' 1 and 8 are returned in a & b
' Call DecToFrac(5/40, a, b) ' 1 and 8 are also returned
' Call DecToFrac(2/3
....Read More |
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Factorial - The factorial of a number
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| Total Hit (1665) |
«Code LangId=1»' The factorial of a number
'
' if NUMBER is negative or >170 it raises an
' "subscript out of range" error
Function Factorial(ByVal number As Long) As Double
Static result(170) As Double
' this routine is very fast because it
' caches all the possible resul
....Read More |
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Fract - The fractional portion of a number
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| Total Hit (1529) |
«Code LangId=1»' The fractional part of a floating-point number
' note that negative numbers return negative values
Function Fract(number As Variant) As Variant
Fract = number - Fix(number)
End Function
«/Code»
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GCD - The Greatest Common Divisor of two integers
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| Total Hit (1632) |
«Code LangId=1»' the Greatest Common Divisor of two integers
' (it uses the Euclide's algorithm)
' if either argument is zero you get a "Division by Zero" error
Function GCD(ByVal n1 As Long, ByVal n2 As Long) As Long
Dim tmp As Long
Do
' swap the items so that n1 >= n2
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GetPrimeNumbers - Evaluate the first N prime numbers
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| Total Hit (1576) |
«Code LangId=1»' Returns an array with the first N prime numbers
'
' Note: you can easily convert this routine to VB4 and VB5 by
' returning the result array through an argument instead of
' the return value
Function GetPrimeNumbers(numberOfPrimes As Long) As Long()
Dim found As Long
....Read More |
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HiWord - The most significant word in a Long value
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| Total Hit (2144) |
«Code LangId=1»
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (dest As _
Any, source As Any, ByVal bytes As Long)
' Return the high word of a Long value.
Function HiWord(ByVal value As Long) As Integer
CopyMemory HiWord, ByVal VarPtr(value) + 2, 2
End Function
....Read More |
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IsPrime - Determine whether a number is prime
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| Total Hit (1578) |
«Code LangId=1»
' Return True if the number is prime
Function IsPrime(ByVal number As Long) As Boolean
' manually test 2 and 3
If number > 3 Then
If number Mod 2 = 0 Then Exit Function
If number Mod 3 = 0 Then Exit Function
End If
' we can now avoid to consi
....Read More |
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LCM - The Least Common Multiple of two integers
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| Total Hit (3290) |
«Code LangId=1»' the Least Common Multiple of two integers
' (it uses the Euclide's algorithm)
' if either argument is zero you get a "Division by Zero" error
'
' Note: if your app also includes the CGD() function,
' you can simplify the following code as follows:
' LCM = (n1 * n2)
....Read More |
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Log10 - Base-10 logarithm
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| Total Hit (1645) |
«Code LangId=1»
' Base 10 logarithm
Function Log10(number As Double) As Double
Log10 = Log(number) / 2.30258509299405
End Function
«/Code»
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LowWord - The least significant word of a Long value.
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| Total Hit (2091) |
«Code LangId=1»Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (dest As _
Any, source As Any, ByVal bytes As Long)
' Return the low word of a Long value
Function LowWord(ByVal value As Long) As Integer
CopyMemory LowWord, value, 2
End Function
«/Code»
....Read More |
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MK? And CV? - Convert numbers to strings and back
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| Total Hit (3057) |
«Code LangId=1»
' This group of routines convert a numeric value into a string
' that contain the internal representation of the number.
' They can be useful when converting outdated QuickBasic programs,
' because that language supported these functions that were
' never ported to Visual Basic
....Read More |
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NormRand - Produce random numbers with normal distribution
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| Total Hit (2306) |
«Code LangId=1»' VBA's intrinsic Rnd function returns numbers evenly
' distributed between 0 and 1. Each number in that
' interval has equal probability of being returned
' for any given function call.
' This function NormRand returns a random number between
' -infinity and +infinity distib
....Read More |
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Power2 - A power of 2
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| Total Hit (1736) |
«Code LangId=1»
' Raise 2 to a power
' the exponent must be in the range [0,31]
Function Power2(ByVal exponent As Long) As Long
Static res(0 To 31) As Long
Dim i As Long
' rule out errors
If exponent < 0 Or exponent > 31 Then Err.Raise 5
' initialize the arr
....Read More |
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Rnd2 - A random value in a range
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| Total Hit (1518) |
«Code LangId=1»
' A random number in the range (low, high)
Function Rnd2(low As Single, high As Single) As Single
Rnd2 = Rnd * (high - low) + low
End Function
«/Code»
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RotateLeft - Rotate a Long to the left
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| Total Hit (1738) |
«Code LangId=1»' Rotate a Long to the left the specified number of times
'
' NOTE: requires Power2()
Function RotateLeft(ByVal value As Long, ByVal times As Long) As Long
Dim i As Long, signBits As Long
' no need to rotate more times than required
times = times Mod 32
....Read More |
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RotateLeftI - Rotate an Integer to the left
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| Total Hit (1769) |
«Code LangId=1»' Rotate an Integer to the left the specified number of times
'
' NOTE: requires Power2()
Function RotateLeftI(ByVal value As Integer, ByVal times As Long) As Integer
Dim i As Long, signBits As Integer
' no need to rotate more times than required
times = time
....Read More |
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RotateRight - Rotate a Long to the right
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| Total Hit (1790) |
«Code LangId=1»' Rotate a Long to the right the specified number of times
'
' NOTE: requires Power2()
Function RotateRight(ByVal value As Long, ByVal times As Long) As Long
Dim i As Long, signBits As Long
' no need to rotate more times than required
times = times Mod 32
....Read More |
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RotateRightI - Rotate an Integer to the right
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| Total Hit (1559) |
«Code LangId=1»' Rotate an Integer to the right the specified number of times
'
' NOTE: requires Power2()
Function RotateRightI(ByVal value As Integer, ByVal times As Long) As Integer
Dim i As Long, signBits As Integer
' no need to rotate more times than required
times = ti
....Read More |
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ShiftLeft - Shift a Long to the left
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| Total Hit (1545) |
«Code LangId=1»' Shift to the left of the specified number of times
'
' NOTE: requires Power2()
Function ShiftLeft(ByVal value As Long, ByVal times As Long) As Long
' we need to create a mask of 1's corresponding to the
' times in VALUE that will be retained in the result
Dim mas
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ShiftRight - Shift a Long to the right
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| Total Hit (2434) |
«Code LangId=1»' Shift to the right of the specified number of times
'
' NOTE: requires Power2()
Function ShiftRight(ByVal value As Long, ByVal times As Long) As Long
' we need to create a mask of 1's corresponding to the
' digits in VALUE that will be retained in the result
Dim
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