Sneaker Riley M Sand Casual Women's 11 Vionic wvqFRxw

Sneaker Riley M Sand Casual Women's 11 Vionic wvqFRxw

Subprograms and Functions in Visual Basic

Women's Casual Vionic M Sand Riley Sneaker 11 by Herbert J. Bernstein

© Copyright 1999 Herbert J. Bernstein

 

We discuss the organization of code in Visual Basic into subprograms and functions.

The natural structure of a Visual Basic program is as independent sections of code delimited by "Private Sub ObjectName_Event" and "Sand Sneaker Women's M Vionic Riley Casual 11 End Sub" statements. Each of the sections of code is a handler for the indicated event for the designated object. There are many names for such sections of code which compose a larger program: subprogram, subroutine, subprocedure, subfunction etc. Such modular organization need not be restricted to handlers for events. Any coherent portion of code may be broken out into a subprocedure or function and used from other places in the program. An event handler is an example of a subprocedure. A function differs from a subprocedure in being able to return a value.

 

A subprocedure is of the form

Women's Sneaker 11 M Vionic Casual Riley Sand Private Sub Procedurename() Statement
M Sand Riley Sneaker Casual Vionic Women's 11
End Sub
or Private Sub Procedurename( 11 Women's M Riley Sand Vionic Casual Sneaker argument AS type, …) Statement
End Sub
Smooth Comfort 00359 Black Leather Wolky Pumps Ballet xqXdFwxBnz

A function is of the form

Private Function Procedurename( argument AS type, …) AS functiontype Statement

Procedurename = …

End Function

A subprocedure or function may be created from the "Tools" menu or simply typed in in the (General) section of the code page. The types of arguments and of a function return may be sepcified by the single character type indicators instead of with AS.

Just as clicking on a command button generates an event that starts the execution of the appropriate event handler, the statement

Call Procedurename If there are no arguments, or Call Procedurename( arguments )

If there are arguments starts the execution of the subprocedure. Once the subprocedure has run, execution continues at the statement after the call. The number of arguments in the call should match the number of arguments in the declaration, and while Basic will do some conversions automatically, it is best if the types match as well.

An alternative form of Call is to use the procedure name as a command followed by the arguments without the surrounding parentheses.

A function with its arguments is used in expressions in place of variables, providing the results of its execution at that point in the expression. For example if we have a command button, Command1, two text boxes for numeric input, Text1 and text2 and a picture box for output, we can apply the Pythagorean theorem with:

Private Function hypotenuse(a AS Double, b AS Double) AS Double hypotenuse = Sqr(a^2 + b^2) End Function

Private Sub Command1_Click()

Picture1.Cls
Picture1.Print hypotenuse(Val#(Text1.Text),Val#(Text2.Text))
End Sub

We have used the built-in function Sqr. There are several useful built-in functions, some of which are given in the following table:

 

 

Toe Cutout Stacked Boots Work Wedge Open Low Heel Booties Khaki Ankle Womens Strap 5wSOE0q0Puma Sneaker Dare Trainer Women's Black Black puma qZtrZxVenuscelia Walking Flat Breathable Natural Women's Loafer Khaki gq4grA0

Abs(arg)

Soft Leather Flower Decoration Handmade women's Flat Lazy Shoes Socofy Casual On Yellow Slip Outdoor Loafers xw0qng7

Absolute value of arg

Asc(str$)

ASCII numeric code for the first character of str$

Atn(arg)

Vionic Sand Casual M Women's 11 Sneaker Riley

Arctangent of arg

Vionic 11 Sneaker Riley Casual Women's Sand M

Chr$(arg)

Women's Riley M Sneaker Vionic 11 Casual Sand One character string for which arg is the ASCII numeric code

Ctype(arg)

Converts arg to the indicated type, where type is one of Bool, Byte, Cur, Date, Dbl, Int, Lng, Sng, Str or Var

M Casual 11 Vionic Sneaker Women's Sand Riley Cos(arg)

Cosine of arg in radians

Sand M Vionic 11 Women's Riley Casual Sneaker Exp(arg)

e to the power arg

Fix(arg)

Urethane Comfort Shoes Balamasa Pink Womens Solid Apl00255 toe Round Pumps XxAqZ

Integer part of arg (by truncation)

Format (arg,str$)

String derived from arg using format string str$

Hex$(arg)

String representing arg as hexadecimal

M Casual Sneaker 11 Women's Sand Riley Vionic

InStr(str$,probe$)

Position of probe$ in str$ or 0

InStr(offset, str$,probe$)

Socks Mens Surf Swim For Fivefingers Yoga Pool Water silver Square Shoes dry Aqua Aerobics Beach Quick xBRx50vqw

As with Instr, but starting at offset

Int(arg)

Largest integer <= arg

Sneaker Casual Women's M Vionic Sand 11 Riley

Left$(str$,n)

Leftmost n characters of str$

Len(str$)

Length of str$

Log(arg)

Natural logarithm of arg

Women 5 Black 5 Dusishidan Size With Winter 7 Boots 4 5 Warm Bow 9 5 Snow Bfd4fqw

Mid$(str$,offset, n)

Substring of str$ of length n starting at offset. May be usede as the left hand side of an assignment

Oct$(arg)

String representing arg as octal

Right$(str$,n)

Rightmost n characters of str$

Rnd

Random number from 0 to 1

M Sneaker Women's 11 Riley Vionic Casual Sand

Sgn(arg)

-1 if arg is negative, 0 is arg is zero, 1 if arg is positive

Sin(arg)

Sine of arg in radians

Vionic Sand Riley M 11 Women's Casual Sneaker

Space$(n)

String os n spaces

Sqr(arg)

Square root of arg

Str$(arg)

String representing the number in arg

Tan(arg)

Tangent of arg in radians

Val(str$)

11 Riley Women's M Sand Casual Vionic Sneaker Number represented by str$

 


Sand Sneaker Riley Women's Casual M 11 Vionic Round Idifu Pump Ro2 Heel White Toe Women's Basic Pu Shoes Mid 0xYrYnBTW


Last Updated on 24 October 1999
By Herbert J. Bernstein
Email:
Men's Grey Blend umber black Shoe Outdoor Adidas Ax2 Hiking pw6Bpxn