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Introduction to Ruby

Ruby isn't limited to simple expressions of assignment like `my_num = 100`

; it can also do all the math you learned about in school.

There are six arithmetic operators we're going to focus on:

Addition (`+`

)

Subtraction (`-`

)

Multiplication (`*`

)

Division (`/`

)

Exponentiation (`**`

)

Modulo (`%`

)

The only ones that probably look weird to you are exponentiation and modulo. Exponentiation raises one number (the base) to the power of the other (the exponent). For example, `2**3`

is `8`

, since `2**3`

means "give me `2 * 2 * 2`

" (2 multiplied together 3 times). `3**2`

is `9`

(3 * 3), and so on.

Modulo returns the remainder of division. For example, `25 % 7`

would be `4`

, since 7 goes into 25 three times with 4 left over.

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