Educator

Looping

• Loops execute a code block more than once, as many times as needed
• Early computing used “goto” – modern computing uses various explicit looping constructs
• “while” loop, tests an expression for “true” before each loop – code block may be skipped completely if expression starts off “false”
• “do-while” loop, tests an expression for “true” after each loop – code block is guaranteed to run at least once
• “for” loop, usually has an explicit loop counter – code block is looped a very specific number of times
• “break” leaves a loop early
• “continue” returns to the beginning of a loop
• Nested loops operate on each sub-item of each item
• Nested loops should use different counters and different termination expressions, otherwise subtle bugs may be introduced
• Here is a link that discusses various kinds of C++ loops: http://www.cplusplus.com/doc/tutorial/control/