$1\mathrm{.}9$ Exercises

Exercise $1\mathrm{.}1.$ It is a good idea to read this book in front of a computer so you can try out the

examples as you go$.$

Whenever you are experimenting with a new feature, you should try to make mistakes. For example,

in the $$Hello$,$ world!$$ program, what happens if you leave out one of the quotation marks? What if

you leave out both? What if you spell print wrong?

This kind of experiment helps you remember what you read; it also helps when you are programming,

because you get to know what the error messages mean. It is better to make mistakes now and on

purpose than later and accidentally.

$1.$ In a print statement, what happens if you leave out one of the parentheses, or both?

$2.$ If you are trying to print a string, what happens if you leave out one of the quotation marks,

or both?

$3.$ You can use a minus sign to make a negative number like $-2.$ What happens if you put a plus

sign before a number? What about $2++2?$