VISUAL BASIC FUNDAMENTALS in Visual Studio .NET

Printer QR Code in Visual Studio .NET VISUAL BASIC FUNDAMENTALS

VISUAL BASIC FUNDAMENTALS
Decode Quick Response Code In VS .NET
Using Barcode Control SDK for .NET Control to generate, create, read, scan barcode image in Visual Studio .NET applications.
QR Code 2d Barcode Printer In .NET
Using Barcode creator for .NET framework Control to generate, create QR Code 2d barcode image in .NET applications.
[CHAP. 2
QR Code Decoder In .NET
Using Barcode reader for VS .NET Control to read, scan read, scan image in .NET applications.
Bar Code Drawer In VS .NET
Using Barcode maker for .NET Control to generate, create bar code image in .NET framework applications.
EXAMPLE 2.14
Scan Bar Code In VS .NET
Using Barcode decoder for .NET framework Control to read, scan read, scan image in .NET applications.
QR Code Maker In Visual C#.NET
Using Barcode creation for Visual Studio .NET Control to generate, create QR-Code image in Visual Studio .NET applications.
Consider the arithmetic expression
QR Encoder In .NET
Using Barcode generation for ASP.NET Control to generate, create QR Code image in ASP.NET applications.
QR Code 2d Barcode Generation In VB.NET
Using Barcode printer for .NET framework Control to generate, create QR Code ISO/IEC18004 image in VS .NET applications.
(c1 + c2) ^ 3
Barcode Creator In Visual Studio .NET
Using Barcode creation for Visual Studio .NET Control to generate, create bar code image in .NET framework applications.
Generate Matrix 2D Barcode In .NET
Using Barcode printer for .NET framework Control to generate, create Matrix Barcode image in Visual Studio .NET applications.
The quantity represented by (c1 + c2) is multiplied by itself twice, thus forming the cubic expression. It does not matter whether the quantity (c1 + c2) is positive or negative. On the other hand, the arithmetic expression
Code 128C Maker In .NET Framework
Using Barcode drawer for VS .NET Control to generate, create Code 128B image in .NET applications.
UPC - E0 Creation In .NET Framework
Using Barcode creation for VS .NET Control to generate, create UPC-E Supplement 2 image in VS .NET applications.
(b ^ 2 4 * a * c) ^ .5
Paint USS Code 128 In Objective-C
Using Barcode generation for iPad Control to generate, create Code128 image in iPad applications.
Generating GS1 DataBar In Java
Using Barcode encoder for Java Control to generate, create GS1 DataBar Expanded image in Java applications.
will be valid only if (b ^ 2 4 * a * c) represents a positive quantity. Finally, consider what happens in the arithmetic expression a ^ n when either a or n is zero. If n has a value of zero, then a ^ n will be assigned a value of 1, regardless of the value of a. If a has a value of zero and n is nonzero, however, then a ^ n will be evaluated as zero.
Barcode Generator In None
Using Barcode maker for Microsoft Excel Control to generate, create barcode image in Excel applications.
Code 39 Full ASCII Maker In .NET Framework
Using Barcode creator for ASP.NET Control to generate, create Code39 image in ASP.NET applications.
2.9 STRING EXPRESSIONS Numerical operations cannot be performed on string constants or string variables. However, strings and string variables can be concatenated (i.e., combined, one behind the other). In Visual Basic we use either the ampersand (&) or the plus sign (+) as a string concatenation operator (the ampersand is favored).
Making Code 128 Code Set A In None
Using Barcode printer for Software Control to generate, create Code 128C image in Software applications.
ANSI/AIM Code 39 Generation In Java
Using Barcode creation for Android Control to generate, create Code 3/9 image in Android applications.
EXAMPLE 2.15
Creating Linear 1D Barcode In C#.NET
Using Barcode printer for VS .NET Control to generate, create Linear Barcode image in .NET framework applications.
Make Barcode In Java
Using Barcode generator for Android Control to generate, create bar code image in Android applications.
Suppose the string variables str1 and str2 have been assigned the following values:
Str1 = "TEN" Str2 = "THOUSAND"
Then the string expression
Str1 & " " & str2 & " DOLLARS"
will cause the three individual strings to be concatenated, resulting in the single string
TEN THOUSAND DOLLARS
Note that we could also have written the string expression as
Str1 + " " + str2 + " DOLLARS"
2.10 ASSIGNING VALUES TO VARIABLES The equal sign (=) is used to assign a numeric or string value to a variable. The general form is Variable = Expression where the value of the expression on the right is assigned to the variable on the left. Note that the expression can consist of a constant, a single variable, or a more complex expression.
CHAP. 2]
VISUAL BASIC FUNDAMENTALS
EXAMPLE 2.16
Shown below are several unrelated assignment statements.
X = 12.5 Cmax = X Area = 3.141593 * Radius ^ 2 Label = "Name: " Str = FirstStr + LastStr
In each statement, the value of the expression on the right of the equal sign is assigned to the variable on the left.
If the variable on the left of the equal sign and the expression on the right differ in their respective data types, Visual Basic will attempt to convert from the data type of the expression to the data type of the variable. Note that this may result in a data loss in some situations. For example, if the expression on the right is a real quantity and the variable on the left is an integer, the fractional part of the expression will be dropped when it is assigned to the integer variable. Moreover, some types of mixed-data-type assignments are incompatible and therefore not allowed. For example, a string expression cannot be assigned to a numeric variable.
EXAMPLE 2.17
Consider the Visual Basic statements shown below.
Dim Radius As Single, Area As Single, Counter As Integer, CircleID as String Radius = 3 CircleID = "Red" Area = 3.141593 * Radius ^ 2 Counter = Area Area = CircleID
The first assignment statement (Area = 3.141593 * Radius ^ 2) does not present any problems, since we are assigning a single-precision real quantity to a single-precision real variable. However, the second assignment statement results in a data loss, because the single-precision value of Area (in this case, 28.27434) is assigned to the integer variable Counter. The decimal portion of Area is dropped, and Counter takes on the integer value 28. The last assignment statement attempts to assign a string to a numeric variable. This operation is not permitted. Hence, the last assignment statement will result in a runtime error.
It is important to understand the difference between an assignment statement and an algebraic equation. Many assignment statements look like algebraic equations. On the other hand, there are certain kinds of assignments that would make no sense if viewed as algebraic equations.
EXAMPLE 2.18
Consider the following assignment statement.
J = J + 1
The assignment term J = J + 1 obviously does not correspond to an algebraic equation, since the equation j = j + 1 makes no sense. What we are doing here is to increase the value of the numeric variable J by one unit. Thus, the assignment term is entirely logical if we interpret it as follows: add 1 to the value originally represented by the variable J, and assign this new value to J. Thus, the new value of J will replace the old value. This operation is known as incrementing.
Copyright © OnBarcode.com . All rights reserved.