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EXAMPLE 2.17 Nested and Parallel Scopes
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int x = 11; main0 1 int x = 22; { int x = tout << > tout << "In tout << "In 1 // thisx is global
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// begin scope of main0 // begin scope of internal block 33; "In block inside main(): x = ' -C-C x CC endl; // end scope of internal block main(): x = ' -C-K x -CC endl; main(): ::x = ' -CC ::x -CC endl; // end scope of main0
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There are three different objects named x in this program. The x that is initialized with the value 11 is a global variable, so its scope extends throughout the file. The x that is initialized with the value 22 has scope limited to main ( ) . Since this is nested within the scope of the first x, it hides the first x within main ( ) . The x that is initialized with the value 33 has scope limited to the internal block within main ( ) , so it hides both the first and the second x within that block. The last line in the program uses the scope resolution operator : : to access the global x that is otherwise hidden in main ( ) .
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2.13 ENUMERATION TYPES In addition to the predefined types such as int and char, C++ allows you to define your own special data types. This can be done in several ways, the most powerful of which use classes as described in s 8-14. We consider here a much simpler kind of user-defined type. An enumeration type is an integral type that is defined by the user with the syntax
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{ enumeratorlist }; Here enum is a C++ keyword, typename stands for an identifier that names the type being defined, and enumera tori is t stands for a list of identifiers that define integer constants. For
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enum typename
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example the following defines the enumeration type Semester, specifying three possible values that a variable of that type can have
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enum Semester {fall, spring, summer};
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We can then declare variables of this type:
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Semester sl, s2;
and we can use those variables and those type values as we would with predefined types:
s l = spring; s2 = fall; i f ( S 1 == s2)
tout
"Same semester.\n";
CONDITIONAL STATEMENTS AND INTEGER TYPES
[CHAP. 2
The actual values defined in the enumera tori is t are called enumerators. In fact, they are ordinary integer values. The values fall, spring, and summer defined for the Semester type above could have been defined like this:
const int fall = 0; const int winter = 1; const int summer = 2;
The values 0, 1, . . . are assigned automatically when the type is defined. These default values can be overridden in the enumera torIis t:
enum Coin {penny = 1, nickel = 5, dime = 10, quarter = 25);
If integer values are assigned to only some of the enumerators, then the ones that follow are given consecutive values. For example,
enum Month {jan = 1, feb, mar, apr, may, jun, jul, aug, sep, act, nov, dec};
will assign the numbers 1 through 12 to the twelve months. Since enumerators are simply integer constants, it is legal to have several different enumerators with the same value:
enum Answer {no = 0, false = 0, yes = 1, true = 1, ok = 1);
This would allow the code
Answer ans; if (ans == yes) tout << "You said it was o.k.\n"; to work as expected. If the value of the variable ans is yes, true, or ok (all of which equal
l), then the condition will be true and the output will occur. Note that since the integer value 1 always means true in a condition, this conditional statement could also be written
if (ans) tout << "You said it was o.k.\n";
Enumeration types are usually defined to make code more self-documenting; i.e., easier to understand. Here are a few more typical examples:
enum enum enum enum enum enum Boolean {false, true}; Sex {female, male}; Day {sun, mon, tue, wed, thu, fri, sat}; Base {binary = 2, octal = 8, decimal = 10, hexadecimal = 16); Color {red, orange, yellow, green, blue, violet}; Rank {two, three, four, five, six, seven, eight, nine, ten, jack, queen, king, ace}; enum Suit {clubs, diamonds, hearts, spades}; enum Roman {I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1000);
Definitions like these can help make your code more readable. But enumerations should not be overused. Each enumerator in an enumerator list defines a new identifier. For example, the definition of Roman above defines the seven identifiers I, V, X, L, C, D, and M as specific integer constants, so these letters could not be used for any other purpose within the scope of . their definition. Note that enumerators must be valid identifiers. So for example, the following would not be
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