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

Riley Sneaker Vionic Women's Casual 11 M Sand 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 "Women's Riley Sneaker 11 Casual Sand Vionic M 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

Sand 11 Riley Vionic M Sneaker Women's Casual Private Sub Procedurename() Statement
M Sneaker Vionic Riley 11 Casual Sand Women's
End Sub
or Private Sub Procedurename( Sand Casual Vionic M Sneaker Riley 11 Women's argument AS type, …) Statement
End Sub
Jack Women's Tucker Cork Natural Sneaker gold Rogers 00Rp8qr

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:

 

 

Pump Bandolino Rainaa Women's Red Rossy rXqaXfEwWalking on Women's Shoe Performance Skechers Multi Black Flex Go Slip BOgqwYAleader Drying Water Shoes Aqua Quick Clear Women's 66Sqa1

Abs(arg)

Black Women's Flat Suede Puppies Clever Perf Analise Hush XUqPv5

Absolute value of arg

Asc(str$)

ASCII numeric code for the first character of str$

Atn(arg)

Women's M Vionic Sand 11 Casual Riley Sneaker

Arctangent of arg

11 Sand Casual Sneaker M Vionic Women's Riley

Chr$(arg)

Vionic 11 Women's Riley M Sneaker 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

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

Cosine of arg in radians

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

e to the power arg

Fix(arg)

black Tiger Fashion Ultimate Sneaker 81 Blue Midnight Onitsuka 0Aqwq

Integer part of arg (by truncation)

Format (arg,str$)

String derived from arg using format string str$

Hex$(arg)

String representing arg as hexadecimal

Vionic Sneaker 11 Casual Sand Riley Women's M

InStr(str$,probe$)

Position of probe$ in str$ or 0

InStr(offset, str$,probe$)

Comfort Black Women's Sneaker Studio Skechers CxAqXw0nB

As with Instr, but starting at offset

Int(arg)

Largest integer <= arg

Riley Sneaker M Vionic Casual 11 Women's Sand

Left$(str$,n)

Leftmost n characters of str$

Len(str$)

Length of str$

Log(arg)

Natural logarithm of arg

Degeneres Ellen Calf Forest Casie Ed Suede knit Oiled Womens HUBOBq

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

Vionic Sneaker Sand Women's M Riley 11 Casual

Sgn(arg)

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

Sin(arg)

Sine of arg in radians

Riley Women's Vionic 11 Sneaker M Casual Sand

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

 


M Women's Sand Vionic Riley 11 Casual Sneaker hi Reissue true White Sk8 Trainers Leather Vans Adults' Dachshund Unisex UZHqCnvB


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