The computer is like a truth machine: you can ask it something and it will tell you whether it is true or false.

Unlike Pinocchio, the computer never lies.

True or false?

When you write a statement to the computer, the computer answers you by true or false:

1. true means that your statement is true
2. false means that your statement is false

Today, we are going to learn about three kind of statements:

1. =: a statement that two things are equal
2. >: a statement that the first thing is greater than the second thing
3. <: a statement that the first thing is less than the second thing

For instance, it is true that 2 and 2 equals 4:

(= (+ 2 2) 4)

It is also true that 7 times 8 is 56:

(= (* 7 8) 56)

But it is false that 5 times 6 is 31:

(= (* 5 6) 31)

Can you modify the statement above and make it true?

It is true that 5 times 7 is greater than 10:

(> (* 5 7) 10)

But it is false that 2 times 2 is greater than 100:

(> (* 2 2) 100)

Can you modify the statement above and make it true?

Exercises

A. Ask the computer if it is true that 7 times 6 equals 40:

()

You should get false.

B. Is it true that 5 and 7 is less than 13?

()

You should get true.

C. Is it true that 3 times 4 is 12?

()

You should get true.

D. Is it true that 3 times 6 equals 10 and 8?

()

You should get true.

E. Is it true that 7 times 7 is greater than 10 times 6?

()

You should get false.

Send us a screenshot with your programs to viebel@gmail.com.

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