Arithmetic operators

Manipulation of number is a fundamental part of all programming and scripting. This article will discuss the correct format by which we can apply these mathematical methods to both previously stored and new data.

There are several arithmetic operators you can use as a ChoiceScript programmer. For each example below, I'm going to use a variable named "var" with a value of 50. The basic ones:

Addition:

*set var + 5

Var is now equal to 55.

Substraction:

*set var - 5

Var is now equal to 45.

Multiplication:

*set var * 5

Var is now equal to 250.

Division:

*set var / 5

Var is now equal to 10.

Then the more advanced ones:

Fairmath:

This operator is a little different than the others; it can be used on variables that are percentages only (from 0 to 100). Fairmath is of two types, "%+" and "%-".

They are used this way:

*set var %+ 20

Var is now equal to 60.

*set var %- 20

Var is now equal to 40.

The idea of fairmath is that the closer a variable is to 100, the harder it is to increase, and the closer a variable is to 0, the harder it is to decrease:

Fair Addition: (x %+ y) = (x + (100-x)*(y/100))

• High variables are harder to increase: (90 %+ 20) = (90 + 2) = 92

• Low variables are easier to increase: (10 %+ 20) = (10 + 18) = 28

Fair Substraction: (x %- y) = (x - x*(y/100))

• High variables are easier to decrease: (90 %- 20) = (90 - 18) = 72

• Low variables are harder to decrese: (10 %- 20) = (10 - 2) = 8

50 is equally easy to increase or decrease, as you've seen above.

Modulo:

This operator is indeed a little weird, but it is useful in two main ways; you can check if a number is evenly divisible to another by writing:

X % Y = 0

so that if we do:

var % 10 = 0

it is true, because 50 / 10 = 5, but if we do:

var % 40 = 0

it is false, because 50 / 40 = 1.25.

You can also get the fractional part of a number, so that if we do this:

*set var / 40

the result will be 1.25; then if we do:

var % 1

the result will be 0.25.

Round()

The *round() is used for setting a variable to the nearest integer, as following:

*set var round(30.5)

this will automatically set "var" to 31.

You can use it with variables instead of numbers, as following:

*set var round(var1)

where "var1" is equal to 20.5; "var" will be equal to 21.

Remember, never make any spaces between "round" and the "(var1)" brackets.

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Related Articles:

• Data Types

• Variable Types
• set