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CHAPTER 8 EXPRESSIONS AND OPERATORS
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Integer literals are the most commonly used literals. They are written as a sequence of decimal digits, with No decimal point An optional suffix to specify the type of the integer For example, the following lines show four literals for the integer 236. Each is interpreted by the compiler as a different type of integer, depending on its suffix. 236 236L 236U 236UL // // // // int long unsigned unsigned long
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Integer type literals can also be written in hexadecimal (hex) form. The digits must be the hex digits (0 through F), and the string must be prefaced with either 0x or 0X (numeral 0, letter x). The forms of the integer literal formats are shown in Figure 8-1. Components with names in square brackets are optional.
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Figure 8-1. The integer literal formats The integer literal suffixes are listed in Table 8-1. For a given suffix, the compiler will interpret the string of digits as the smallest of the corresponding integer types that can represent the value without losing data. For example, take the literals 236 and 5000000000, neither of which has a suffix. Since 236 can be represented with 32 bits, it will be interpreted by the compiler as an int. The larger number, however, will not fit into 32 bits, so the compiler will represent it as a long. Table 8-1. Integer Literal Suffixes
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Suffix
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None U, u L, l ul, uL, Ul, UL lu, Lu, lU, LU
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int, uint, long, ulong uint, ulong long, ulong ulong
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Notes
Using the lowercase letter l is not recommended, as it is easily mistaken for the digit 1. Using the lowercase letter l is not recommended, as it is easily mistaken for the digit 1.
CHAPTER 8 EXPRESSIONS AND OPERATORS
Real Literals
Literals for real numbers consist of the following: Decimal digits An optional decimal point An optional exponent part An optional suffix For example, the following code shows various formats of literals of the real types: float double double double f1 d1 d2 d3 = = = = 236F; 236.714; .35192; 6.338e-26;
The valid formats for real literals are shown in Figure 8-2. Components with names in square brackets are optional. The real suffixes and their meanings are shown in Table 8-2.
Figure 8-2. The real literal formats Table 8-2. Suffixes for the Real Literals
Suffix
None F, f D, d M, m
Real Type
double float double decimal
Note Real literals without a suffix are of type double, not float!
CHAPTER 8 EXPRESSIONS AND OPERATORS
Character Literals
A character literal consists of a character representation between two single quote marks. A character representation can be any of the following: a single character, a simple escape sequence, a hex escape sequence, or a Unicode escape sequence. The type of a character literal is char. A simple escape sequence is a backslash followed by a single character. A hex escape sequence is a backslash, followed by an upper or lowercase x, followed by up to four hex digits. A Unicode escape sequence is a backslash, followed by an upper or lowercase u, followed by up to four hex digits. For example, the following code shows various formats of character literals: char char char char c1 c2 c3 c4 = = = = 'd'; '\n'; '\x0061'; '\u005a'; // // // // Single character Simple escape sequence Hex escape sequence Unicode escape sequence
Some of the important special characters and their encodings are shown in Table 8-3. Table 8-3. Important Special Characters
Name
Null Alert Backspace Horizontal tab New line Vertical tab Form feed Carriage return Double quote Single quote Backslash
Escape Sequence
\0 \a \b \t \n \b \f \r \" \' \\
Hex Encoding
0x0000 0x0007 0x0008 0x0009 0x000A 0x000B 0x000C 0x000D 0x0022 0x0027 0x005C
CHAPTER 8 EXPRESSIONS AND OPERATORS
String Literals
String literals use double quote marks rather than the single quote marks used in character literals. There are two types of string literals: Regular string literals Verbatim string literals A regular string literal consists of a sequence of characters between a set of double quotes. A regular string literal can include the following: Characters Simple escape sequences Hex and Unicode escape sequences Here s an example: string st1 = "Hi there!"; string st2 = "Val1\t5, Val2\t10"; string st3 = "Add\x000ASome\u0007Interest"; A verbatim string literal is written like a regular string literal, but is prefaced with an @ character. The important characteristics of verbatim string literals are the following: Verbatim literals differ from regular string literals in that escape sequences are not evaluated. Everything between the set of double quotes including what would normally be considered escape sequences is printed exactly as it is listed in the string. The only exception with verbatim literals is sets of contiguous double quotes, which are interpreted as a single double quote character.
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