Which input value causes "Goodbye" to be output next?

x = int(input())
while x = 0:
# Do something
x = int(input())
print('Goodbye')

Question

Which input value causes "Goodbye" to be output next?

x = int(input())
while x >= 0:
    # Do something
    x = int(input())
print('Goodbye')

BlackTom AI · Accepted Answer

Consider how the loop in the code operates. The line x = int(input()) reads the first value, and the loop condition is while x >= 0. This means the loop body only runs if the current x is at least 0; otherwise, the program skips the loop and immediately executes print('Goodbye').
Option 0: If the first input were 0, the condition x >= 0 would be true, so the loop would execute at least once, and the program would not print 'Goodbye' immediately. It would require additional inputs inside the loop before potentially reaching the print statement.
Option 1: If the first input were 1, the same logic as for 0 applies—the loop runs, delaying the 'Goodbye' output until later inputs change x to a negative value or the loop ends from another path. This would not cause 'Goodbye' to be output next right away.
Option -1: This is the value that makes the initial condition false (since -1 >= 0 is false). Therefore the loop body is skipped entirely, and the program proceeds directly to print('Goodbye'), producing the output on the next line as requested.
Option 'No such value': This would imply no input could trigger 'Goodbye' next, which is incorrect because -1 does exactly that by failing the loop condition immediately.
In summary, the only input that makes the next output 'Goodbye' appear immediately is -1, because it prevents entering the while loop from the very start. Hence, the option '-1' is the correct choice.

CSE-20-01 Practice Midterm

Which input value causes "Goodbye" to be output next? x = int(input()) while x >= 0: # Do something x = int(input()) print('Goodbye')

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