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EXAMPLE 3.16 Using the else if Construct to Select a Range of Scores
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This program converts a test score into its equivalent letter grade: int main() { int score; cout << "Enter your test score: "; cin >> score; if (score > 100) cout << "Error: that score is out of range."; else if (score >= 90) cout << "Your grade is an A." << endl; else if (score >= 80) cout << "Your grade is a B." << endl; else if (score >= 70) cout << "Your grade is a C." << endl; else if (score >= 60) cout << "Your grade is a D." << endl; else if (score >= 0) cout << "Your grade is an F." << endl; else cout << "Error: that score is out of range."; } Enter your test score: 83 Your grade is a B. The variable score is tested through a cascade of selection statements, continuing until either one of the conditions is found to be true, or the last else is reached.
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3.11 THE switch STATEMENT The switch statement can be used instead of the else if construct to implement a sequence of parallel alternatives. Its syntax is
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switch (expression) { case constant1: statementList1; case constant2: statementList2; case constant3: statementList3; : : case constantN: statementListN; default: statementList0; } This evaluates the expression and then looks for its value among the case constants. If the
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value is found among the constants listed, then the statements in the corresponding statementList are executed. Otherwise if there is a default (which is optional), then the program branches to its statementList. The expression must evaluate to an integral type (see Section 2.1 on page 16) and the constants must be integral constants. EXAMPLE 3.17 Using a switch Statement to Select a Range of Scores
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This program has the same effect as the one in Example 3.16: int main() { int score; cout << "Enter your test score: "; cin >> score; switch (score/10) { case 10: case 9: cout << "Your grade is an A." << endl; case 8: cout << "Your grade is a B." << endl; case 7: cout << "Your grade is a C." << endl;
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break; break; break;
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case 6: cout << "Your grade is a D." << endl; break; case 5: case 4: case 3: case 2: case 1: case 0: cout << "Your grade is an F." << endl; break; default: cout << "Error: score is out of range.\n"; } cout << "Goodbye." << endl; } Enter your test score: 83 Your grade is a B. Goodbye. First the program divides the score by 10 to reduce the range of values to 0 10. So in the test run, the score 83 reduces to the value 8, the program execution branches to case 8, and prints the output shown. Then the break statement causes the program execution to branch to the first statement after the switch block. That statement prints Goodbye. . Note that scores in the ranges 101 to 109 and -9 to -1 produce incorrect results. (See Problem 3.14.)
It is normal to put a break statement at the end of each case clause in a switch statement. Without it, the program execution will not branch directly out of the switch block after it finishes executing its case statement sequence. Instead, it will continue within the switch block, executing the statements in the next case sequence. This (usually) unintended consequence is called a fall through. EXAMPLE 3.18 An Erroneous Fall-through in a switch Statement
This program was intended to have the same effect as the one in Example 3.17. But with statements, the program execution falls through all the case statements it encounters: int main() { int score; cout << "Enter your test score: "; cin >> score; switch (score/10) { case 10: case 9: cout << "Your grade is an A." << endl; // LOGICAL case 8: cout << "Your grade is a B." << endl; // LOGICAL case 7: cout << "Your grade is a C." << endl; // LOGICAL case 6: cout << "Your grade is a D." << endl; // LOGICAL case 5: case 4: case 3: case 2: case 1: case 0: cout << "Your grade is an F." << endl; // LOGICAL default: cout << "Error: score is out of range.\n"; } cout << "Goodbye." << endl; } Enter your test score: 83 Your grade is a B. Your grade is a C. no break
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