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More on Program Flow 183

7

Examining while (true)Loops....................................................................

The condition tested in a whileloop can be any valid C++ expression. As long as that

condition remains true, the whileloop continues. You can create a loop that never ends

by using the value truefor the condition to be tested. Listing 7.5 demonstrates counting

to 10 using this construct.

LISTING7.5 whileLoops

1: // Listing 7.5

2: // Demonstrates a while true loop

3: #include <iostream>

4:

5: int main()

6: {

7: int counter = 0;

8:

9: while (true)

10: {

11: counter ++;

12: if (counter > 10)

13: break;

14: }

15: std::cout << “Counter: “ << counter << std::endl;

16: return 0;

17: }

Counter: 11

On line 9, a whileloop is set up with a condition that can never be false. The

loop increments the counter variable on line 11, and then on line 12 it tests to see

OUTPUT

The breakStatement

break;causes the immediate end of a while, do...while, or forloop. Execution jumps to

the closing brace.

Example

while (condition)

{

if (condition2)

break;

// statements;

}

ANALYSIS