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Summing up Math Operations

You have covered a lot of math in this chapter, but more importantly, you were able to expand your knowledge of working with numbers and variables and start doing some calculations with them. Table 4.1 will serve as a handy reference for the operations that were covered in this chapter:

Table 4.1. Mathematical Operators

Operator

Definition

Example

+

Addition

4 + 5 results in 9

Subtraction

5 – 4 results in 1

*

Multiplication

2 * 3 results in 6

/

Division

5 / 2 results in 2.5

%

Modulo

5 / 2 results in 1

+=

Addition assignment

if x is 5, x += 3 changes x to 8

-=

Subtraction assignment

if x is 5, x -= 2 changes x to 3

*=

Multiplication assignment

if x is 5, x *= 3 changes x to 15

/=

Division assignment

if x is 5, x /= 2 changes x to 2.5

%=

Modulo assignment

if x is 5, x %= 2 changes x to 1

++

Increment

if x is 5, x++ changes x to 6

--

Decrement

if x is 5, x-- changes x to 4

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