vb.net barcode font 8: Variable Data Types in Java

Encoder Data Matrix 2d barcode in Java 8: Variable Data Types

CHAPTER 8: Variable Data Types
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Figure 8-2. The warning generated by the compiler when our code exceeded the range of our data type
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Figure 8-3. When I ran typeOverflow, the program kept running in an infinite loop. Notice the change from 255 back to 0 in the console window.
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Click the red stop sign icon in the console window s tool bar, or select Stop from the Run menu to stop the program.
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CHAPTER 8: Variable Data Types
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The problem with this program occurs when the for loop increments counter when it has a value of 255. Since an unsigned char can hold a maximum value of 255, incrementing it gives it a value of 0 again. Since counter can never get higher than 255, the for loop never exits. Just for kicks, edit the code and change the unsigned char to a signed char. What do you think will happen Try it! The real solution here is to use the right type for your situation and to test, test, test your code. As your programming skills mature, start reading up on the process of testing your code. Testing your code is a vital part of delivering a successful product.
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Working with Characters
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With its minimal range, you might think that a char isn t good for much. Actually, the C deities created the char for a good reason. It is the perfect size to hold a single alphabetic character. In C, an alphabetic character is a single character placed between a pair of single quotes (''). Here s a test to see if a char variable contains the letter 'a':
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char c = 'a'; if ( c == 'a' ) printf( "The variable c holds the character 'a'." ); c;
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As you can see, the character 'a' is used in both an assignment statement and an if statement, just as if it were a number or a variable.
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The ASCII Character Set
In C, a signed char takes up a single byte and can hold a value from 128 to 127. Now, how can a char hold a numerical value, as well as a character value, such as 'a' or '+' The answer lies with the ASCII character set.
NOTE
ASCII stands for the American Standard Code for Information Interchange.
CHAPTER 8: Variable Data Types
The ASCII character set is a set of 128 standard characters, featuring the 26 lowercase letters, the 26 uppercase letters, the 10 numerical digits, and an assortment of other exciting characters, such as } and =. Each of these characters corresponds exactly to a value between 0 and 127. The ASCII character set ignores the values between 128 and 1. For example, the character 'a' has an ASCII value of 97. When a C compiler sees the character 'a' in a piece of source code, it substitutes the value 97. Each of the values from 0 to 127 is interchangeable with a character from the ASCII character set.
WIDE CHARACTER DATA TYPES
Though we ll make use of the ASCII character set throughout this book, you should know that there are other character sets out there. Some foreign alphabets have more characters than can be represented by a single byte. To accommodate these multibyte characters, ISO C features wide character and wide string data types. Though we won t get into multibyte character sets in this book, you should keep these things in mind as you write your own code. Read up on the multibyte extensions introduced as part of the ISO C standard. There s an excellent write-up in Samuel Harbison and Guy Steele s C: A Reference Manual; the fifth edition was released in 2002 (Prentice Hall) a terrific C reference and well worth the purchase price. Here s an article whose title tells it all: The Absolute Minimum Every Software Developer Absolutely, Positively Must Know About Unicode and Character Sets (No Excuses!) by Joel Spolsky:
http://joelonsoftware.com/articles/Unicode.html
Rock on, Joel!
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