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Chapter 6 Repetition
while Loop
Simplest loop
Two parts: test expression and loop body Pretested loop
– Execute loop body if test true – Bypass loop body if test false
Lesson 6.1
General Structure
while (expression)
Logical expression (variable or arithmetic expression) Boolean results (True or False)
statement2 …
Lesson 6.1 }
Steps In Using a while Loop
1. Initialize variable acting as test expression 2. Evaluate the boolean test
3. If true execute statements within loop 4. Update the variable
5. Go back to step 2
Note: if no change to variable then infinite loop (never ends) is created
Lesson 4.1
Example while Loop
int i= 0, number = 1; Initialize variables while (number) Variable as expression
{ value other than zero tests true cout << “Please type a number. ”
<< “Type 0 (zero) to stop execution.\n”;
cin >> number; i++;
Loop body
if (i > 50) break;
} Statements that provide exit from loop
Lesson 6.2
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