Question

When do you use a while loop instead of a for loop? (Select multiple answers)

1. You do not know how many times a loop will need to run
2. To do number calculations
3. When using a count variable
4. To repeat code.

Answer 1

A while loop is most appropriate when the number of loop iterations is not predetermined. For loops are favored for fixed iteration counts and when using a count variable in a straightforward manner. Both loops can be used to repeat code, but context and clarity will dictate the best choice.

Step-by-step explanation:

When deciding whether to use a while loop or a for loop, there are specific scenarios where one is more appropriate than the other:

• You would use a while loop if you do not know how many times a loop will need to run because while loops are ideal when the number of iterations is not predetermined.
• To do number calculations, both while and for loops can be used, but typically a for loop is preferred if you know the exact number of iterations.
• When using a count variable, for loops are generally used because they provide a straightforward way to increment or decrement the count. However, a while loop can also be used if the count is affected by conditions within the loop rather than a simple iteration.
• To repeat code, either type of loop can be used. The choice often depends on the clarity and simplicity of the code for the given context.

Therefore, answer option 1, "You do not know how many times a loop will need to run", is the most fitting scenario to choose a while loop over a for loop.