The C++ Data Types in Java

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The C++ Data Types
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This chapter surveys the built-in, or primitive, data types predefined within C++ It begins with a look at literal constants, such as
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314159 and "pi", and then introduces the concept of a symbolic variable, or object An object within a C++ program must be defined to be of a specific type The remainder of the chapter walks through the different types for which an object may be declared In addition, we contrast the built-in C++ support for strings and arrays with the class abstractions provided by the C++ standard library Although the library abstractions are not primitive types, they are fundamental types to real-world C++ programs, and we wish to introduce them as early as possible to encourage and illustrate their use We like to refer to these types as making up an extended basic language of primitive built-in and primitive class abstraction types
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Literal Constant
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C++ predefines a set of numeric data types, which allow the representation of integers, floating point numbers, and individual characters and predefines a character array to represent a string
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The type char is typically used to represent individual characters and small integers It is represented in a single machine byte The types short, int, and long represent integer values of different sizes Typically, shorts are represented in half a machine word, ints in a machine word, and longs in either one or two machine words (on 32-bit machines, ints and longs are usually the same size) The types float, double, and long double represent floating point single, double, and extended precision values Typically, floats are represented in one word; doubles in two words, and long double in either three or four words
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char, short, int, and long are collectively referred to as the integral types Integral types may be either signed or unsigned In a signed type, the left-most bit serves as the sign bit, and the remaining bits represent the value In an unsigned type, all the bits represent the value If the sign bit is set to 1, the value is interpreted as negative; if 0, positive An 8-bit signed char may represent the values -128 through 127; an unsigned char, 0 through 255 When a value such as 1 occurs in a program, it is referred to as a literal constant: literal because we can speak of it only in terms of its value; constant because its value cannot be changed Every literal has an associated type 0, for example, is of type int 314159 is a literal constant of type double We refer to a literal constant as nonaddressable; although its value is stored somewhere in the computer's memory, we have no means of accessing that address Literal integer constants can be written in decimal, octal, or hexadecimal notation (This does not change the bit representation of the value) The value 20, for example, can be written in any of the following three ways:
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Appending a 0 (zero) to a literal integer constant causes it to be interpreted as octal Appending either 0x or 0X will cause a literal integer constant to be interpreted as hexadecimal ( 20, The iostream Library, discusses printing values in octal or hexadecimal notation) By default, literal integer constants are treated as signed values of type int A literal integer constant can be specified as being of type long by following its value with either L or l (the letter "ell" in either uppercase or lowercase) Using the lowercase letter in general should be avoided, because it is easily mistaken for the number 1 In a similar manner, a literal integer constant can be specified as being unsigned by following its value with either U or u An unsigned long literal constant can also be specified For example:
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128u
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