Question at position 7 If the missing lines are filled in correctly, the program should continuously take a number from the user and add it to a total until they enter a negative number, where the program will end and output the total of all previous numbers. Negative numbers should NOT be included in the total. Below is an example output of the program, where bolded text is input to the program: Enter a number: 3Enter a number: 7Enter a number: -2Total: 10 [table] 1 total = 02 keep_adding = True3 4 while keep_adding:5 number = int(input('Enter a number: '))6 if number # ( code WILL go here ) 0:7 # ( code WILL go inside IF )8 else:9 # ( code WILL go inside ELSE )10 print('Total:', total) [/table] Which of the following options is the correct missing code? (Code filled in has been bolded.)6 if number > 0:7 keep_adding = True8 else:9 total = total + number6 if number < 0:7 total = total + number8 else:9 keep_adding = False6 if number < 0:7 keep_adding = False8 else:9 total = total + number6 if number <= 0:7 total = total + number8 else:9 keep_adding = TrueClear my selection单项选择题
A
6 if number > 0: 7         keep_adding = True 8     else: 9         total = total + number
B
6     if number < 0: 7         total = total + number 8     else: 9         keep_adding = False
C
6 if number < 0: 7         keep_adding = False 8     else: 9         total = total + number
D
6     if number <= 0: 7         total = total + number 8     else: 9         keep_adding = True

Question

Question at position 7 If the missing lines are filled in correctly, the program should continuously take a number from the user and add it to a total until they enter a negative number, where the program will end and output the total of all previous numbers. Negative numbers should NOT be included in the total. Below is an example output of the program, where bolded text is input to the program: Enter a number: 3Enter a number: 7Enter a number: -2Total: 10 [table]
1  total = 02 keep_adding = True3 4  while keep_adding:5 number = int(input('Enter a number: '))6 if number # ( code WILL go here ) 0:7 # ( code WILL go inside IF )8 else:9 # ( code WILL go inside ELSE )10 print('Total:', total)
[/table] Which of the following options is the correct missing code? (Code filled in has been bolded.)6 if number > 0:7 keep_adding = True8 else:9 total = total + number6 if number < 0:7 total = total + number8 else:9 keep_adding = False6 if number < 0:7 keep_adding = False8 else:9 total = total + number6 if number <= 0:7 total = total + number8 else:9 keep_adding = TrueClear my selection

BlackTom AI · Accepted Answer

Negative input must stop the loop and should not be added to the running total, so the program should check whether the entered number is less than 0; if so, set keep_adding to False, otherwise add the number to total. 1. Relevant concepts - Loop control: while keep_adding continues until keep_adding becomes False. - Input handling: convert input to int and decide whether to add to total or terminate. - Conditional logic: number < 0 identifies the termination condition; non-negative numbers (including 0) should be added. 2. Step-by-step reasoning - Start: total = 0, keep_adding = True. - Each loop iteration reads number = int(input(...)). - If number < 0, we must stop further additions and exit the loop by setting keep_adding = False. - If number is not negative (i.e., >= 0), we add it to total with total = total + number. - After the loop ends, print the accumulated total. 3. Intermediate steps / example run - Input 3: condition number < 0? No → else branch: total = 0 + 3 → total = 3. - Input 7: number < 0? No → else: total = 3 + 7 → total = 10. - Input -2: number < 0? Yes → keep_adding = False (do not add -2). - Loop ends; print('Total:', 10). 4. Why the correct answer is correct - The correct snippet precisely implements the requirement: detect a negative number to stop (keep_adding = False) and otherwise add the input to total. This ensures negatives are never included and the loop terminates as soon as a negative is entered. 5. Why other options are incorrect - Option 1 (if number > 0: keep_adding = True else: total += number): Leaves keep_adding True on negative inputs and adds negatives to total, never terminating. - Option 2 (if number < 0: total += number else: keep_adding = False): Adds negatives and stops on non-negatives — reversed behavior. - Option 4 (if number <= 0: total += number else: keep_adding = True): Adds zero and negatives (<=0 includes negatives), so negatives would be included. 6. Confirmation of final answer The correct code block is: 6 if number < 0: 7 keep_adding = False 8 else: 9 total = total + number This matches the provided answer.

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