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Literals
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In C#, literals refer to fixed values that are represented in their human-readable form For example, the number 100 is a literal For the most part, literals and their usage are so intuitive that they have been used in one form or another by all the preceding sample programs Now the time has come to explain them formally C# literals can be of any simple type The way each literal is represented depends upon its type As explained earlier, character literals are enclosed between single quotes For example, a and % are both character literals Integer literals are specified as numbers without fractional components For example, 10 and 100 are integer literals Floating-point literals require the use of the decimal point followed by the number s fractional component For example, 11123 is a floating-point literal C# also allows you to use scientific notation for floating-point numbers Since C# is a strongly typed language, literals, too, have a type Naturally, this raises the following question: What is the type of a numeric literal For example, what is the type of 12, 123987, or 023 Fortunately, C# specifies some easy-to-follow rules that answer these questions First, for integer literals, the type of the literal is the smallest integer type that will hold it, beginning with int Thus, an integer literal is either of type int, uint, long, or ulong, depending upon its value Second, floating-point literals are of type double If C# s default type is not what you want for a literal, you can explicitly specify its type by including a suffix To specify a long literal, append an l or an L For example, 12 is an int, but 12L is a long To specify an unsigned integer value, append a u or U Thus, 100 is an int, but 100U is a uint To specify an unsigned, long integer, use ul or UL For example, 984375UL is of type ulong To specify a float literal, append an F or f to the constant For example, 1019F is of type float Although redundant, you can specify a double literal by appending a D or d (As just mentioned, floating-point literals are double by default) To specify a decimal literal, follow its value with an m or M For example, 995M is a decimal literal
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3:
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D a t a Ty p e s , L i t e r a l s , a n d Va r i a b l e s
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Although integer literals create an int, uint, long, or ulong value by default, they can still be assigned to variables of type byte, sbyte, short, or ushort as long as the value being assigned can be represented by the target type
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PART I
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As you probably know, in programming it is sometimes easier to use a number system based on 16 instead of 10 The base 16 number system is called hexadecimal and uses the digits 0 through 9 plus the letters A through F, which stand for 10, 11, 12, 13, 14, and 15 For example, the hexadecimal number 10 is 16 in decimal Because of the frequency with which hexadecimal numbers are used, C# allows you to specify integer literals in hexadecimal format A hexadecimal literal must begin with 0x (a 0 followed by an x) Here are some examples:
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count = 0xFF; // 255 in decimal incr = 0x1a; // 26 in decimal
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Character Escape Sequences
Enclosing character literals in single quotes works for most printing characters, but a few characters, such as the carriage return, pose a special problem when a text editor is used In addition, certain other characters, such as the single and double quotes, have special meaning in C#, so you cannot use them directly For these reasons, C# provides special escape sequences, sometimes referred to as backslash character constants, shown in Table 3-2 These sequences are used in place of the characters they represent For example, this assigns ch the tab character:
ch = '\t';
The next example assigns a single quote to ch:
ch = '\'';
Escape Sequence \a \b \f \n \r \t \v \0 \' \" \\
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