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C# 30: A Beginner s Guide
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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 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 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 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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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 zero 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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Enclosing character constants 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 single and double quotes, have special meaning in C#, so you cannot use them directly For these reasons, C# provides special escape sequences, shown in Table 2-2 These sequences are used in place of the characters that they represent For example, this assigns ch the tab character:
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ch = '\t';
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The next example assigns a single quote to ch:
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ch = '\'';
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2:
Introducing Data Types and Operators
Escape Sequence
\a \b \f \n \r \t \v \0 \' \" \\
Description
Alert (bell) Backspace Form feed Newline (linefeed) Carriage return Horizontal tab Vertical tab Null Single quote Double quote Backslash
Table 2-2
Character Escape Sequences
String Literals
"this is a test"
C# supports another type of literal: the string A string literal is a set of characters enclosed by double quotes For example,
is a string You have seen examples of strings in many of the WriteLine( ) statements in the preceding sample programs In addition to normal characters, a string literal can also contain one or more of the escape sequences just described For example, consider the following program It uses the \n and \t escape sequences
Ask the Expert
Q: A:
I know that C++ allows integer literals to be specified in octal (a number system based on 8) Does C# allow octal literals No C# allows integer literals to be specified only in decimal or hexadecimal form Octal is seldom used in today s modern programming environments
C# 30: A Beginner s Guide
// Demonstrate escape sequences in strings using System;
Use \n to generate a new line class StrDemo { static void Main() { ConsoleWriteLine("First line\nSecond line"); ConsoleWriteLine("A\tB\tC"); Use tabs to align output ConsoleWriteLine("D\tE\tF"); } }
The output is shown here:
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