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CONDITIONAL STATEMENTS AND INTEGER TYPES
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E n t e r t h e test txxxez - 9 ._ .Errur: scure is out of rqxp3. The variable s c o r e is tested through a cascade of conditionals, continuing until one of the conditions is found to be true, or until the last el se is reached as in the third run.
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The sequence of mutually exclusive-alternatives delineated by the multiple el se i f construct can also be coded using a switch statement. Its syntax is
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switch (expression) { case constantl: statementList1; case constan t2: statementLis t2; case constantN: statementListN; default: statementList;
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The switch statement evaluates the expression and then looks for its value among the case constants. If the value is found among the cons tan ts listed, then the statements in that s ta temen tLi s t are executed. Otherwise if there is a def au1 t (which is optional), then the program branches to that s ta temen tLis t. Note that the expression must evaluate to an integer type and that the constants must be integer constants (which include chars).
EXAMPLE 2.15
The program has the same effect as the program in Example 2.14:
main0 int score; tout << "Enter the test score: '; tin >> score; switch (score/lo) { case 10: case 9: tout << 'A' << endl; break; case 8: tout << 'B' << endl; break; case 7: tout << 'Cl << endl; break; case 6: tout << D << endl; break; case 5: case 4: case 3: case 2: case 1: case 0: tout << 'F' << endl; break; default: tout << "Error: score is out of range.\n";
CONDITIONAL STATEMENTS AND INTEGER TYPES
[CHAP. 2
First the program divides the score by 10. In the second run .where the input is 47, the expression score / 10 evaluates to 4. Then that value is located in the case list, and every statement from there to the next break is executed. That spans all the cases down to case 0 to reach the next break statement. This phenomenon is called a fall through. 2.11 THE CONDITIONAL EXPRESSION OPERATOR
C++ provides an abbreviated form of a special case of the i f . . . el se statement. It is called the conditional expression operator and uses the and the : symbols in a special ternary format:
condition expression1 : expression2
Like any operator, this combines the given expressions to produce a value. The value produced is either the value of expression1 or that of expression2, according to whether the condition is true or false. For example, the assignment statement
min =x<y x:y;
will assign the value of
to min if
< y, otherwise it assigns the value of y to min.
The conditional expression operator is generally used only when the condition and both expressions are very simple. 2.12 SCOPE The scope of an identifier is that part of the program where it can be used. For example variables cannot be used before they are declared, so their scopes begin where they are declared. This is illustrated by the next example.
EXAMPLE 2.16 Scope of Variables main0 -t x = 11; int x; x = y = int x = y = > x = 66; y = 77. I
ERROR:
this is not in the scope of x
22; 33, I y; 44; 55;
// OK: this is in the scope of x // ERROR: this is not in the scope of y // OK: this is in the scope of x // OK: this is in the scope of y
// OK: this is in the scope of x // ERROR: this is not in the scope of y
The scope of x extends from the point where it is declared to the end of main ( > . The scope of y extends from the point where it is declared to the end of the internal block within which it is declared.
CHAP. 21
CONDITIONAL
STATEMENTS
INTEGER
TYPES
A program may have several objects with the same name as long as their scopes are nested or disjoint. This is illustrated by the next example:
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