Sams Teach Yourself C++ in 21 Days

19: case 1: cout << “Incredible!” << endl;

20: break;

21: default: cout << “Too large!” << endl;

22: break;

23: }

24: cout << endl << endl;

25: return 0;

26: }

Enter a number between 1 and 5: 3

Excellent!

Masterful!

Incredible!

Enter a number between 1 and 5: 8

Too large!

The user is prompted for a number on lines 9 and 10. That number is given to the

switchstatement on line 11. If the number is 0 , the casestatement on line 13

matches, the message Too small, sorry!is printed, and the breakstatement on line 14

ends the switch. If the value is 5 , execution switches to line 15 where a message is

printed, and then falls through to line 16, another message is printed, and so forth until

hitting the breakon line 20, at which time the switch ends.

The net effect of these statements is that for a number between 1 and 5, that many mes-

sages are printed. If the value of number is not 0 to 5, it is assumed to be too large, and

the default statement is invoked on line 21.

OUTPUT

200 Day 7

LISTING7.16 continued

ANALYSIS

The switchStatement

The syntax for the switchstatement is as follows:

switch (expression)

{

case valueOne: statement;

case valueTwo: statement;

....

case valueN: statement;

default: statement;

}

The switchstatement allows for branching on multiple values of expression. The expres-

sion is evaluated, and if it matches any of the casevalues, execution jumps to that line.

Execution continues until either the end of the switchstatement or a breakstatement is

encountered.