The do...while loop is similar to the while loop, but with one important difference: it always runs at least once.
In a do...while loop, the code runs first and the condition is checked after that. This is useful when you want to make sure a task happens at least one time, even if the condition is false at the beginning.
When to Use the do...while Loop
- When code must run at least once
- When taking user input before checking a condition
- When showing menus in programs
- When running initial setup tasks
- When building retry systems
The do...while loop is perfect for situations where one execution is guaranteed.
In this example, the message is printed first and then the condition is checked.
Even if the condition were false at the start, the loop would still run once.
Here, the condition is false from the beginning, but the code still runs one time.
This clearly shows the main difference between while and do...while loops.
These examples show how the do...while loop ensures at least one execution.
By mastering this loop, students can handle user-driven programs, menus, and repeated actions that must happen at least once.