Question at position 18 Which of the following lines of code will run, but then give a runtime error?num = 10for i in range(10,3): num = num/inum = 10for i in range(3,3): num = num/inum = 10for i in range(-2,3): num = num/inum = 10for i in range(2,3): num = num/iClear my selection

Question

BlackTom AI · Accepted Answer

Division by zero raises a ZeroDivisionError in Python, so we must find the for-loop whose sequence of i-values includes 0 (and that actually executes at least one iteration before the error).

Relevant concepts:
- range(start, stop) generates integers from start up to stop-1. If start >= stop, the range is empty and the loop body never executes.
- In Python, dividing by 0 (e.g., num / 0) raises a ZeroDivisionError at runtime.
- We check each candidate loop to see which iterates and whether any iteration uses i == 0.

Step-by-step reasoning and intermediate steps:

1) num = 10
   for i in range(10, 3):
     num = num / i
   - range(10, 3) is empty because start > stop. The loop body never runs. No division occurs and no runtime error is raised.

2) num = 10
   for i in range(3, 3):
     num = num / i
   - range(3, 3) is empty (start == stop). The loop body never runs. No division, no runtime error.

3) num = 10
   for i in range(-2, 3):
     num = num / i
   - range(-2, 3) yields i = -2, -1, 0, 1, 2. The loop executes and proceeds until a division by zero occurs:
     - i = -2: num = 10 / -2 = -5.0 (no error)
     - i = -1: num = -5.0 / -1 = 5.0 (no error)
     - i = 0: num = 5.0 / 0 -> ZeroDivisionError (runtime error occurs here)
   - This code starts running and then raises a runtime error when i == 0.

4) num = 10
   for i in range(2, 3):
     num = num / i
   - range(2, 3) yields i = 2 only. num = 10 / 2 = 5.0, loop finishes normally. No runtime error.

Why the correct answer is correct:
Option 3 is the only loop that both executes iterations and includes i == 0, causing a division by zero at runtime after some successful iterations. The other options either never execute the loop body (options 1 and 2) or execute without encountering zero (option 4).

Therefore the correct choice is:
num = 10
for i in range(-2,3):
  num = num/i

This matches the provided answer.

Question at position 18 Which of the following lines of code will run, but then give a runtime error?num = 10for i in range(10,3): num = num/inum = 10for i in range(3,3): num = num/inum = 10for i in range(-2,3): num = num/inum = 10for i in range(2,3): num = num/iClear my selection单项选择题

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