CS: Loops and Conditional Statements Worksheet

Question 1

Trace this code and write the output: count = 1; while count <= 4: print(count); count = count + 1.

Accepted Answer

The output is 1, 2, 3, and 4 on separate lines because the loop prints count each time and stops after count becomes 5.

Question 2

A program should print Even if a number is divisible by 2 and Odd if it is not. Write an if-else statement in pseudocode for this task.

Accepted Answer

A correct answer is: if number % 2 == 0, print Even; else, print Odd. The condition checks whether there is no remainder after dividing by 2.

Question 3

Trace this for loop and write the final value of total: total = 0; for i from 1 to 5: total = total + i.

Accepted Answer

The final value of total is 15 because the loop adds 1 + 2 + 3 + 4 + 5.

Question 4

Explain the difference between a loop and a conditional statement.

Accepted Answer

A loop repeats a block of code multiple times, while a conditional statement chooses which block of code to run based on whether a condition is true or false.

Question 5

Find the bug in this code and explain how to fix it: x = 1; while x < 10: print(x).

Accepted Answer

The bug is that x never changes inside the loop, so the loop may run forever. A fix is to add x = x + 1 inside the loop after the print statement.

Question 6

Write a loop in pseudocode that prints the numbers 10, 9, 8, 7, and 6.

Accepted Answer

A correct answer is: for number from 10 down to 6, print number. This loop starts at 10 and decreases by 1 until it prints 6.

Question 7

Trace this code and write the output: score = 82; if score >= 90: print(A); else if score >= 80: print(B); else: print(C).

Accepted Answer

The output is B because 82 is not at least 90, but it is at least 80.

Question 8

A game gives 10 points for each coin collected. Write pseudocode that uses a loop to add points for 6 coins.

Accepted Answer

A correct answer is: score = 0; repeat 6 times: score = score + 10. After the loop, the score is 60.

Question 9

Trace this nested decision and write what is printed: age = 13; hasTicket = true; if age >= 12: if hasTicket == true: print(Enter); else: print(Buy ticket); else: print(Too young).

Accepted Answer

The program prints Enter because age is at least 12 and hasTicket is true.

Question 10

Choose whether a for loop or while loop is better for this task and explain why: keep asking for a password until the user enters the correct password.

Accepted Answer

A while loop is better because the program does not know ahead of time how many tries the user will need.

Question 11

Write an if-else statement in pseudocode that prints Freezing if temperature is 32 or below, and Not freezing otherwise.

Accepted Answer

A correct answer is: if temperature <= 32, print Freezing; else, print Not freezing. The condition checks whether the temperature is 32 or lower.

Question 12

Trace this code and write the final value of x: x = 3; for i from 1 to 4: if i % 2 == 0: x = x + i.

Accepted Answer

The final value of x is 9 because the loop only adds the even values of i, which are 2 and 4, to the starting value 3.

CS: Loops and Conditional Statements

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