Why do we use while loops? To repeat code a specific number of times To use if-else statements in a loop To repeat code when the number of times to repeat is unknown To determine if a condition is true

We use while loops primarily for the third reason you listed: to repeat code when the number of times to repeat is unknown.

Here's a step-by-step explanation:

1. A while loop is a control flow statement that allows code to be executed repeatedly based on a given Boolean condition.

2. The while loop can be thought of as a repeating if statement. The code inside the loop is executed, over and over again, as long as the condition is true.

3. The condition is checked before executing the loop body. If the condition is false at the start, the loop body will not be executed at all.

4. This is particularly useful when we don't know in advance how many times we need to loop. For example, we might want to keep asking a user for input until they enter a valid response.

5. While loops can also be used with if-else statements inside them, but this is not the primary reason we use while loops.

6. Similarly, while loops can be used to repeat code a specific number of times, but for loops are often more suitable for this purpose because they provide a built-in way to count the number of iterations.

7. Lastly, while loops do not determine if a condition is true. They execute based on whether a condition is true, but the determination of the condition's truth value is done by the logic in your code, not by the while loop itself.