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Exercise 54 Change the declaration of occurs in the argument list of min() to be a nonreference argument type and rerun the program How does the behavior of the program change
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The switch Statement
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Deeply nested if-else statements can often be correct syntactically and yet not express the intended logic of the programmer Unintended else-if matchings, for example, are more likely to pass unnoticed Modifications to the statements are also much harder to get right As an alternative method of choosing among a set of mutually exclusive choices, C++ provides the switch statement To illustrate the use of the switch statement, let's consider the following problem: we have been asked to count the number of occurrences of each of the five vowels in random segments of text (The conventional wisdom is that e is the most frequently occurring vowel in English) Our program logic is as follows:
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Read each character in turn until there are no more characters to read Compare each character to the set of vowels If the character matches one of the vowels, add 1 to that vowel's count Display the results
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The program was used to analyze a section of this text Here is the output, which verifies the conventional wisdom regarding the frequency of the vowel e:
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aCnt: eCnt: iCnt: oCnt: uCnt:
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394 721 461 349 186
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The switch statement consists of the following components: 1 The switch keyword, following by an expression in parentheses that is to be evaluated In our case, the expression is the character read For example:
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char ch; while ( cin >> ch ) switch( ch )
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2 A set of case labels consisting of the keyword case followed by a constant expression against which to compare the result of the switch expression, followed by a colon In our case, each case label represents one of the five English vowels For example:
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case 'a': case 'e': case 'i':
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case 'o': case 'u':
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3 A sequence of program statements associated with one or a set of case labels To accumulate a count of each vowel, for example, we would provide an assignment statement incrementing a vowel's count by 1 4 An optional default label The default label serves as a kind of else clause If the switch expression does not match any of the case labels, the statements following the default label are evaluated For example, if we wished to count the number of characters that were not vowels, we might add the following default label and statement:
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default: // everything not a vowel ++non_vowel_cnt;
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The value following the case keyword must be a constant expression of an integral type The following, for example, result in compile-time errors:
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// illegal case label values case 314: // noninteger case ival: // nonconstant
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In addition, no two case labels may have the same value; if they do, a compile-time error occurs The switch expression can be an arbitrarily complex expression, including the return of a function call The result of the switch expression is compared against the value associated with each case label until either a match is successful or all labels have been examined If the expression matches the value of a case label, execution begins with the first statement following that label If no match is effected, execution begins with the first statement following the default label, if one is present; otherwise, the execution of the program continues with the first statement following the switch statement A common misunderstanding is that only the statements associated with the matched case label are executed Rather, execution begins there but continues across case boundaries until the end of the switch statement is encountered Getting this wrong is a good guarantee that we've also gotten our program wrong For example, here is an incorrect implementation of our vowel-counting switch program:
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#include<iostream> int main() { char ch; int aCnt=0, eCnt=0, iCnt=0, oCnt=0, uCnt=0; while ( cin >> ch ) // warning: deliberately incorrect! switch ( ch ) { case 'a': ++aCnt; case 'e': ++eCnt; case 'i':
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