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return 0; THE FOUNDATION OF C++ }
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Although the if-else-if ladder can perform multiway tests, it is hardly elegant The code can be difficult and confusing to follow For these reasons, C/C++ has a built-in multiple-branch selection statement, called switch, which successively tests the value of an expression against a list of integer or character constants When a match is found, the statements associated with that constant are executed The general form of the switch statement is switch(expression) { case constant1: statement sequence break; case constant2: statement sequence break; case constant3: statement sequence break; default: statement sequence } The default statement is executed if no matches are found The default is optional, and if it is not present, no action takes place if all matches fail When a match is found, the statement sequence associated with that case is executed until the break statement or the end of the switch statement is reached There are three important things to know about the switch statement: 1 The switch differs from the if in that switch can only test for equality, whereas if can evaluate any type of relational or logical expression 2 No two case constants in the same switch can have identical values Of course, a switch statement enclosed by an outer switch may have case constants of the same value
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3 If character constants are used in the switch statement, they are automatically converted to integer (as specified by the type conversion rules) The switch statement is often used to process keyboard commands, such as menu selection As shown here, the function menu( ) displays a menu for a spelling-checker program and calls the proper procedures:
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void menu(void) { char ch; printf("1 Check Spelling\n"); printf("2 Correct Spelling Errors\n"); printf("3 Display Spelling Errors\n"); printf("Strike Any Other Key to Skip\n"); printf(" Enter your choice: "); ch = getche(); /* read the selection from the keyboard */ switch(ch) { case '1': check_spelling(); break; case '2': correct_errors(); break; case '3': display_errors(); break; default : printf("No option selected"); } }
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Technically, the break statements inside the switch statement are optional They terminate the statement sequence associated with each constant If the break statement is omitted, execution continues on into the next case s statements until either a break or the end of the switch is reached You can think of the cases as labels Execution starts at the label that matches and continues until a break statement is found, or the switch ends For example, the following function uses the drop through nature of the cases to simplify the code for a device-driver input handler:
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void inp_handler(void) { int ch, flag;
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Program Control Statements
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ch = read_device(); /* read some sort of device */ flag = -1; switch(ch) { case 1: /* these cases have common statement */ case 2: /* sequences */ case 3: flag = 0; break; case 4: flag = 1; case 5: error(flag); break; default: process(ch); } }
This example illustrates two aspects of switch First, you can have case statements that have no statement sequence associated with them When this occurs, execution simply drops through to the next case In this example, the first three cases all execute the same statements, which are
flag = 0; break;
Second, execution of one statement sequence continues into the next case if no break statement is present If ch matches 4, flag is set to 1 and, because there is no break statement at the end of the case, execution continues and the call to error(flag) is executed In this case, flag has the value 1 If ch had matched 5, error(flag) would have been called with a flag value of 1 (rather than 1) The fact that cases can run together when no break is present prevents the unnecessary duplication of statements, resulting in more efficient code
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