Bug tracking and fixing in Intro to Computing - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ trace

intermediate

Trace the output of a simple loop with a bug

What will be the output of the following code snippet?

Intro to Computing

numbers = [1, 2, 3, 4]
result = 0
for num in numbers:
    result += num
print(result)

A SyntaxError

B 0

C TypeError

D 10

💡 Hint

Think about what the loop does to the result variable.

The loop adds each number in the list to result. The sum of 1+2+3+4 is 10.

❓ identification

intermediate

Identify the type of error in a code snippet

What type of error will the following code produce?

Intro to Computing

def greet(name):
    print('Hello, ' + name)
greet()

A IndentationError

B NameError

C TypeError

D SyntaxError

💡 Hint

Check the function call and its parameters.

The function greet requires one argument, but it is called without any, causing a TypeError.

🧠 Conceptual

advanced

Understanding the debugging process

Which step is not part of the typical debugging process?

A Writing new unrelated features

B Isolating the cause

C Identifying the problem

D Testing the fix

💡 Hint

Think about what debugging focuses on.

Debugging focuses on finding and fixing problems, not adding new unrelated features.

❓ Comparison

advanced

Compare error types in code snippets

Which code snippet will cause a SyntaxError?

A

x = 10
print(x)

B if x == 5 print('Yes')

C

for i in range(3):
    print(i)

D print('Hello' + 'World')

💡 Hint

Look for missing punctuation or structure errors.

Option B is missing a colon after the if statement, causing a SyntaxError.

🚀 Application

expert

Find the output after fixing a bug in code

After fixing the bug in the code below, what will be the output?

Intro to Computing

def calculate_area(radius):
    area = 3.14 * radius ** 2
    return area

result = calculate_area(5)
print(result)

A 78.5

B SyntaxError

C TypeError

D None

💡 Hint

Check the formula and the function return.

The function correctly calculates the area of a circle with radius 5: 3.14 * 5^2 = 78.5.