Make sure you’ve loaded the (CPO), clicked “Run”, and are working in the Interactions Area.


1 Try typing 42 into the Interactions Area and hitting “Enter”. What is the largest number the editor can handle?

2 Try typing 0.5. Then try typing .5. Then try clicking on the answer. Experiment with other decimals. Explain what you understand about how decimals work in this programming language.

3 What happens if you try a fraction like 1/3?

4 Try writing negative integers, fractions and decimals. What do you learn?


String values are always in quotes.

5 Is 42 the same as "42"? Why or why not? Write your answer below:

  • Try typing your name (in quotes!).

  • Try typing a sentence like "I’m excited to learn to code!" (in quotes!).

  • Try typing your name with the opening quote, but without the closing quote. Read the error message!

  • Now try typing your name without any quotes. Read the error message!

6 Explain what you understand about how strings work in this programming language.


7 Just like math, Pyret has operators like +, -, * and /. Try typing in 4 + 2, and then 4+2 (without the spaces). What can you conclude from this?

8 Type in the following expressions, one at a time: 4 + 2 * 6, (4 + 2) * 6, 4 + (2 * 6). What do you notice?

9 Try typing in 4 + "cat", and then "dog" + "cat". What can you conclude from this?

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