Question at position 14 What will be the output of the program after the following code fragment is executed? [table]
1 def check_age(age: int):2 if age

Question

Question at position 14 What will be the output of the program after the following code fragment is executed? [table]
1  def check_age(age: int):2 if age < 13:3 return 'Child'4 elif age < 20:5 return 'Teenager'6 else:7 return 'Adult'8 9  print(check_age(18))10 print(check_age(10))11 print(check_age(25))
[/table] Teenager Teenager AdultAdultChildAdultChildTeenagerAdultTeenagerChildAdultClear my selection

BlackTom AI · Accepted Answer

The function check_age categorizes ages: 'Child' for age < 13, 'Teenager' for age < 20 (but >= 13), and 'Adult' otherwise.

1. Relevant knowledge points and concepts
- Function definition and return: return exits the function immediately with a value.
- Conditional branching order: if checked first, then elif, then else. The first true condition determines the returned value.
- Comparison operators: age < 13 and age < 20 are numeric comparisons.
- print() outputs the returned string followed by a newline.

2. Step-by-step reasoning for each call
- print(check_age(18)):
  - Enter check_age with age = 18.
  - Evaluate if age < 13 → 18 < 13 is False, so skip that branch.
  - Evaluate elif age < 20 → 18 < 20 is True, so return 'Teenager'.
  - print prints 'Teenager' followed by a newline.

- print(check_age(10)):
  - Enter check_age with age = 10.
  - Evaluate if age < 13 → 10 < 13 is True, so return 'Child' immediately.
  - print prints 'Child' followed by a newline.

- print(check_age(25)):
  - Enter check_age with age = 25.
  - Evaluate if age < 13 → 25 < 13 is False.
  - Evaluate elif age < 20 → 25 < 20 is False.
  - else branch executes, return 'Adult'.
  - print prints 'Adult' followed by a newline.

3. Intermediate steps (explicit)
- check_age(18) → False, True → return 'Teenager'
- check_age(10) → True → return 'Child'
- check_age(25) → False, False → return 'Adult'

4. Why the correct answer is correct
Because the conditional order ensures ages 13–19 hit the elif and return 'Teenager', ages below 13 hit the first if and return 'Child', and all others hit else and return 'Adult'. The three print calls therefore output Teenager, then Child, then Adult on separate lines.

5. Why the other options are incorrect
- "Teenager
Teenager
Adult": second call (10) would not be 'Teenager' because 10 < 13 yields 'Child'.
- "Adult
Child
Adult": first call (18) is not 'Adult' because 18 < 20 yields 'Teenager'.
- "Child
Teenager
Adult": ordering is wrong; check_age(18) produces 'Teenager', not 'Child'.

6. Conclusion and final answer
The program prints:
Teenager
Child
Adult

This matches the provided correct answer: "Teenager
Child
Adult".

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