visual basic 2008 barcode generator Data Types and Variables in Java

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CHAPTER 2 Data Types and Variables
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look at a simple example so that you understand this point Let s say you have the real number 55543213421 Suppose this number represented the change someone is to receive after making a purchase Only two of the ten digits following the decimal are important because the smallest denomination of US currency is a penny Therefore, the change is $555 Programmers call the numbers following the decimal that are important to the program significant numbers In the previous example, there are two significant numbers: 55 The other numbers (43213421) are insignificant and can be ignored by your program Some Java programs require that a number have a specific degree of accuracy This is called precision For example, the previous example requires two significant digits of precision because the customer expects to receive every penny of change that is due Floating-point literals are stored with a precision of approximately seven significant digits or approximately 15 significant digits Seven-digit precision is called single precision, whereas 15-digit precision is called double precision The word approximately is used because values may not correspond exactly to decimal digits because numbers are represented as binary values By default, floating-point values are stored using single precision Therefore, 51234567891011121314 is stored as 51234567 If your program requires more than seven significant digits, you need to store the value using double precision Using the symbol F or f at the end of the value, as shown in this example, specifies double precision:
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class Demo { public static void main( String args[]) { Systemoutprintln("Scientific Notation: + 5E+10F); Systemoutprintln("Scientific Notation: + 5E-20F); Systemoutprintln("Scientific Notation: + 5E30f); } }
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Boolean Literals
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Whenever you see the term Boolean, you should think of true and false, yes and no, on and off, and 0 and 1, because a Boolean value can be one of two values A Boolean value cannot be yes, no, and maybe It must be one value or another value
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You write a Boolean literal by using the Boolean operators true and false You ll learn more about these in the next chapter In this example, two Boolean literals are assigned to variables You ll learn about variables later in this chapter For now, think of a variable as an empty box into which your program places a Boolean value The box is actually computer memory that is identified by a label We use box1 and box2 as labels for memory in the following example:
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class Demo { public static void main( String args[]) { boolean box1 = true; boolean box2 = false; } }
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Character Literals
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A character is a letter, number, punctuation, or any other character defined in Unicode It is easy to become confused between a number that is treated as a character and a number that is treated as a numeric value because they look very much alike For example, the house number in the address 121 Gordon Street is treated as a character, as compared to the expression 5 + 10, which contains numeric values However, programs treat these differently A numeric value can be directly used in a calculation, whereas a number character is a Unicode value that must be converted to a numeric value A character literal is a character defined by Unicode that you write into your program by placing the character between single quotations Be careful Placing a character literal in double quotations is a common error made when writing a character literal As you ll learn in the next section, double quotations are used to write a string literal, which is materially different from a character literal Here s how to write a character literal in your program:
class Demo { public static void main( String args[]) { Systemoutprintln("Character Literal: } }
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As good practice, don t write numeric values as character literals if they will be used in a calculation Numeric values should be written as integer literals or as floating-point literals; otherwise, you ll need to convert the character literal version of the number of an integer literal or floating-point literal before it can be used in a calculation
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