►C211/  H211:   Introduction to Computer Science
▼Lectures
8.6.0.14
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Lecture 3: Parentheses

This assignment is due on Sunday, August 28 at 11:59pm. Submit it using Handin as assignment lecture3. Your submission is only accepted if the message “Handin successful” appears.

Exercise 1. Put the missing closing parenthesis in the right place:

(place-image (scale 2 bicycle horizontal-position 150 (empty-scene 300 300))

Put the fixed expression in a comment.

Exercise 2. Answer each problem below with one arithmetic formula. Indent each formula properly.

  1. At the market, I bought an apple for $1 and a sandwich for $5. What is the total that I spent? The answer to this problem is (+ 1 5), so put this in your Definitions Window:
    (define part1 (+ 1 5))

  2. At the market, I bought an apple for $1 and a sandwich for $5. Because a sandwich is a prepared food item, it is taxed 7%. What is the total that I spent? Define a constant named part2 with your formula.

  3. At the market, I bought a baked apple for $1 and a sandwich for $5. Because both are prepared food items, both are taxed 7%. What is the total that I spent? Define a constant named part3 with your formula.

  4. At the restaurant, I ordered a baked apple for $1 and a sandwich for $5. Both are taxed 7%, and I also decided to pay 20% tip on the amount before tax was added. The tip is not taxed. What is the total that I spent? Define a constant named part4 with your formula.

  5. At the restaurant, I ordered a baked apple for $1 and a sandwich for $5. Both are taxed 7%, and I also decided to pay 20% tip on the amount after tax was added. What is the total that I spent? Define a constant named part5 with your formula.

  6. Like the last probem, but what if I rounded up the final amount to the nearest dollar (using the ceiling function)? Define a constant named part6 with your formula.

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