while loop vs do-while loop

while Loop:

This is a standard while loop because:

• The condition i < 5 is checked before each iteration.
• If i were greater than or equal to 5 from the start, the loop would not execute even once.

do-while Loop:

Python does not have a built-in do-while loop like some other programming languages (e.g., C, C++, or Java). However, you can mimic the behavior of a do-while loop using a while loop with a condition that ensures the loop executes at least once.

This behaves like a do-while loop because:

• The loop starts with while True:, which guarantees that the loop body will execute at least once.
• Inside the loop, the condition (i < 5) is checked after the loop body has been executed.
• The break statement is used to exit the loop if the condition is not met, mimicking the post-condition check of a do-while loop.

Can You Assume while True: is a do-while Loop?

You can assume that while True: may simulate a do-while loop if there is a condition inside the loop that determines whether the loop should continue or exit (using a break statement). However, not all while True: loops are do-while loops. The significant feature that makes a while True: loop similar to a do-while loop is checking the exit condition inside the loop body after at least one execution.

Significant Features of Each

• while Loop:
  • Condition is evaluated before the loop body executes.
  • May not execute the loop body at all if the condition is initially False.
• do-while Loop (simulated with while True: in Python):
  • Loop body is guaranteed to execute at least once.
  • Exit condition is checked after the loop body has been executed.