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CONDITIONAL STATEMENTS AND INTEGER TYPES
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2.9 NESTED CONDITIONALS Like compound statements, conditional statements can be used wherever any other statement can be used. So a conditional statement can be used within another conditional statement. This is called nesting conditional statements. For example, the condition in the last example could be restated equivalently as
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if (d > 0) if (n%d == 0) tout << d << ' divides ' -CC n CC endl; else tout << d << ' does not divide ' << n << endl; else tout << d << ' does not divide ' << n << endl;
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Here extra indentation is used to help clarify the complex logic. Of course, the compiler ignores all indentation and white space. To parse the statement, it uses the following e 1 se matching rule: A4atch each else with the last unmatched i f. Using this rule, the compiler can easily decipher code as inscrutable as this:
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if (a > 0) if (b > 0) ++a; else if (c > 0) if (a < 4) ++b; else if (b c 4) ++c; else --a else if (c < 4) --b; else --c; else a = 0;
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To make it readable for humans, that code should be written either like this:
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if (a > 0) if (b > 0) ++a; else if (c > 0) if (a < 4) ++b; else if (b < 4) ++c; else --a; else if (c < 4) --b; else --c; else a = 0;
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or like this:
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if (a > 0) if (b > 0) ++a; else if (c > 0) if (a < 4) ++b; else if (b c 4) ++c; else --a; else if (c < 4) --b; else --c; else a = 0;
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CONDITIONAL STATEMENTS AND INTEGER TYPES
[CHAP. 2
EXAMPLE 2.13 The Maximum of Three Again Here is yet another way to do what was done in Example 2.8 and Example 2.10:
main0 int a, b, c, max; tout << "Enter three integers: "; tin >> a >> b >> c; if (a > b) // a > b and a > c if (a > c) max = a; // c >= a > b else max = c; else // b >= a and b > c if (b > c) max = b; // c >= b >= a else max = c; tout << 'The maximum is H << max CC endl;
In the first run, the test ( a > b ) fails, so the second el se executes the test ( b > c ) which also fails, thus executing the third el se which assigns c to max. In the second run, the test (a > b) succeeds, and then the test (a > c ) also succeeds, so a is assigned to max.
This program is more efficient than the one in Example 2.10 because it evaluates only two simple conditions instead of three compound conditions. Nevertheless, it should be considered inferior because its logic is more complicated. The in-line comments are really needed to clarify the logic. In the trade-off between efficiency and simplicity, the one should opt for simplicity. Nested conditionals are by their very nature complicated. So it is usually better to avoid them whenever possible. An exception to this rule is a special form of nested conditional where all except possibly the last else is immediately followed by another i f. This is a popular logical structure because it delineates in a simple way a sequence of disjoint alternatives. To clarify the logic, programmers usually line up the e 1 se i f phrases, as shown in the next example.
EXAMPLE 2.14 This program converts a test score into its equivalent letter grade:
main0 . int score; tout << "Enter the test score: I'; tin >> score; if (score > 100) tout CC "Error: score is out of range."; else if (score >= 90) tout CC 'A'; else if (score >= 80) tout C-C 'B'; else if (score >= 70) tout << 'C'; else if (score >= 60) tout << 'D'; else if (score >= 0) tout << 'F'; else tout -CC "Error: score is out of range.";
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