generate barcode c# asp.net Copyright 2006 by The McGraw-Hill Companies Click here for terms of use in Java

Decoder ECC200 in Java Copyright 2006 by The McGraw-Hill Companies Click here for terms of use

Copyright 2006 by The McGraw-Hill Companies Click here for terms of use
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Visual Basic 2005 Demysti ed
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Data comes in different varieties Some data is numeric, such as the amount of my gas bill or the height of a form Some data is text, such as my name on my gas bill or the text on the title bar of a form Some data is Boolean (either true or false), such as whether I qualify for the senior citizen discount or whether a form is visible The type of information, whether numeric, text, or Boolean, is referred to as the data type I will explain in this chapter the different data types and how to select the one that best fits your purpose You also will need to store data Visual Basic forms and controls have many built-in properties to store data, such as the Text property of a Label or TextBox control However, these properties are limited to storing the information they were designed for The Height property of a form only can store a form s height, not some other information you need to store Visual Basic 2005 enables you to create your own information storage locations, called variables I will show you in this chapter how to create and use variables Finally, certain values never change while a program is running For example, if you are writing a program to calculate the cost of a transaction, the percentage of sales tax will not change while your program is running These values that do not change while your program is running are called constants I will also show you in this chapter how to create and use constants
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Data Types
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Think of all the different types of information you need to keep in your mind For example, if you as a student were driving to school for the first day of class, you would not want to be late Therefore, you would consider the number of miles to school in deciding what time to leave You may wonder if you will be able to get into the class and try to remember the name of the teacher you need to ask The class will be tough, so you think about the effect the class might have on your grade point average Some of these items of information are numeric, such as the number of miles to school and your grade point average However, the name of the teacher is not numeric, but text, and whether you will be able to get into the class will be either yes or no The type of information, whether text, numeric, or yes/no, is referred to as the data type
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Storing Information Data Types and Variables
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Visual Basic has a number of data types Integer being the most common that may be used for whole numbers A whole number may be positive (55) or negative ( 55) or zero However, the Integer data type should not be used for floating-point numbers that is, those that have numbers to the right of the decimal point, such as 5, 05, or 55 The Integer keyword for this data type is an alias for the SystemInt32 data type in the NET Framework Indeed, each of the Visual Basic data type keywords we will be discussing is an alias for a corresponding NET Framework data type An Integer would be a good choice for the number of miles to school Normally, you would think it is 8 miles to school, for example, not 83 miles, as there is no need to be so precise as to figure out tenths of miles Visual Basic has several data types, such as Double, Single, and Decimal, that may be used for floating-point numbers (for example, 5, 05, and 55) These data types would be a good choice for the grade point average, such as 391, because for a grade point average you want to take into account the digits to the right of the decimal point After all, if you worked hard to earn a 391 grade point average, you would not want the 91 ignored, thus making your grade point average 3 instead N OTE The Integer and Double data types can handle almost all numbers you may use in a program However, there are numbers that are too large for either data type to handle, such as distances between galaxies in the universe There also are numbers that may be too small for the Double data type to handle, such as the size of an atom However, these circumstances are relatively rare The Boolean data type has only two possible values: True and False The Boolean data type would be a good choice to report whether you got into the class because there are only two alternatives: yes (True) and no (False) N OTE The Boolean data type is considered numeric because 0 (zero) is considered False and all nonzero numbers True
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