VB6 Tutorial 47: More Numeric Functions

This lesson is about the numeric functions in VB6. Before proceeding with this lesson, you may want to read VB6 Tutorial 34: Handy Numeric functions.

As mentioned in the previous lesson 34, VB6 contains many useful operators and functions to efficiently work with numbers. In this post, I'll go over a few more of them.

Abs

It returns the absolute value of a number.

Example

Private Sub Form_Load()
    Form1.Show
    Print abs(-10)
End Sub

Output

Sin, Cos and Tan

These functions return the sine, cosine and tangent of an angel. These functions receive arguments in radian. Convert radian to degree multiplying Pi/180. You may declare a Pi constant at the beginning.

Example

Private Sub Form_Load()
    Form1.Show
    Print Sin(90)
    Print Cos(0)
    Print Tan(45)
End Sub

Output

0.893996663600558
1
1.61977519054386

Exp

The Exp function returns e (the base of natural logarithms) raised to a power.

Example

Private Sub Form_Load()
    Form1.Show
    Print Exp(5)    'equivalent to e^5
End Sub

Output

148.413159102677

Log

The Log function returns the natural logarithm of a number.

Example

Private Sub cmdPrint_Click()
    Print Log(10)
End Sub

Output

2.30258509299405

Sgn

This function indicates the sign of a number. It returns -1, 0 or 1 if the number is negative, zero or positive respectively.

Example

Private Sub cmdShowSign_Click()
    Print Sgn(-10)
End Sub

Output

-1

The Fix function

Fix function truncates the decimal part of a number. In Lesson 34, you have seen that the Int function also truncates the decimal part of a number. But this function is different from the Fix function. You see the difference when the number is negative in case of the Int function. So the function that actually truncates the decimal part of a number is Fix.

Example

Private Sub cmdTruncate_Click()
    Print Fix(4.5)
    Print Fix(-4.5)
End Sub

Output

4
-4

The Rnd function

Sometimes, we need to generate some random values. The Rnd function returns a random value between 0 and 1.

QuickHint:

Rnd is not a variable, it is a function.

Example

Each time the CommandButton is clicked , it gives a different value between 0 and 1.

Private Sub cmdGenerateRandomNumbers_Click()
    Randomize()   'Randomizes the number
    lblResult.Caption = Rnd
End Sub

Output

Random Number Output

The attached example project demonstrates how to generate values between the numbers you specify.

The Hex and Oct functions

The Hex function returns the string representation of its hexadecimal equivalent and the Oct function converts the number to Octal.

Example

Private Sub cmdConvert_Click()
    Print Hex(10), Oct(50)
End Sub

Output

A                 62

To convert a hexadecimal or octal number into decimal value

Example

Private Sub cmdConvert_Click()
    Print Val("&H" & "A")   'A is the Hexadecimal number
    Print Val("&O" & "62")  '62 is an octal number
End Sub

Output

10
50

About this post

Posted: 2018-05-20
By: vb6boy
Viewed: 1,427 times

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