Identifying and Correcting Errors - AP Computer Science Principles

1. What is the result of '3 ** 2' in Python?

   Result: 9. Double asterisk performs exponentiation in Python.

2. What is the binary representation of the decimal number 10?

   Binary: 1010. Convert decimal to binary using powers of 2.

3. What is the correct syntax for defining a function in Python?

   def function_name(parameters):. Standard function definition syntax in Python.

4. What is the ASCII value for the character 'A'?

   ASCII: 65. Standard ASCII value for uppercase A character.

5. Which Python keyword is used to handle exceptions?

   try. Used with except to catch and handle errors.

6. What is the purpose of 'break' in a loop?

   Exits the loop prematurely. Immediately terminates loop execution and continues after loop.

7. Identify the error in 'if x > 5 then y = 10;' in Python.

   Remove 'then': 'if x > 5: y = 10'. Python doesn't use 'then' keyword in if statements.

8. What is the correct syntax for a for-loop in Python?

   for i in range(n):. Standard Python loop syntax iterating from 0 to n-1.

9. What is the error in 'if (x > y) print('x is greater');' in Python?

   Use a colon: 'if (x > y): print('x is greater');'. Python if statements require colon after condition.

10. What operator is used to check equality in Python?

    ==. Double equals tests equality, single equals assigns values.

11. What is the hexadecimal representation of the decimal number 15?

    Hexadecimal: F. 15 in decimal equals F in hexadecimal (base 16).

12. What is the result of '7 % 2' in Python?

    Result: 1. Modulo operator returns remainder of division operation.

13. What is the correct method to add an element to a list in Python?

    list.append(element). Standard method to add elements to Python lists.

14. What is the value of $10 \bmod 3$?

    Value: 1. Modulo operation returns remainder after division.

15. What is the output of 'print(2 ** 3)' in Python?

    Output: 8. Double asterisk is the exponentiation operator in Python.

16. Find the error in 'while x = 5: pass' in Python.

    Correct: 'while x == 5: pass'. Single equals is assignment, double equals is comparison.

17. What is the decimal equivalent of the binary number 1101?

    Decimal: 13. Binary 1101 = $8 + 4 + 1 = 13$ in decimal.

18. What is the purpose of the 'return' statement in a function?

    Returns a value from a function. Exits function and sends value back to caller.

19. Find the error in 'while (x = 10): pass' in Python.

    Use '==' for comparison: 'while (x == 10): pass'. Assignment operator used instead of equality comparison.

20. Find the error in 'print 5 + 5' in Python 3.

    Use parentheses: 'print(5 + 5)'. Python 3 requires parentheses for print function calls.

21. What is the output of '10 / 3' in Python 3?

    Output: 3.3333... Python 3 performs true division by default.

22. What is the correct way to start a comment in Python?

    #. Hash symbol starts single-line comments in Python.

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