Type Tables
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Type Tables

This page shows the all the different results that you may get when performing arithmetic operations on the different data types in GML.

The tables all follow the same format, with the rows (left) showing the left hand side of an arithmetical operation, and the columns (right) showing the right hand side, e.g.:

<result> = <LHS or row> + <RHS or column>

IMPORTANT Prior to GameMaker 2022.9, these tables were inverted -- the columns showed LHS and rows showed RHS. This was counter-intuitive and was changed to be the opposite.

Add (+) Real Bool String Int32 Int64 Ptr undefined Array
Real Real Real String Real Real Error Error Error
Bool Real Real String Real Real Error Error Error
String Error Error String Error Error Error Error Error
Int32 Real Real String Int32 Int64 Error Error Error
Int64 Real Real String Int64 Int64 Error Error Error
Ptr Error Error Error Error Error Error Error Error
undefined Error Error Error Error Error Error Error Error
Array Error Error Error Error Error Error Error Error

 

Subtract (-) Real Bool String Int32 Int64 Ptr undefined Array
Real Real Real Error Real Real Error Error Error
Bool Real Real Error Real Real Error Error Error
String Error Error Error Error Error Error Error Error
Int32 Real Real Error Int32 Int64 Error Error Error
Int64 Real Real Error Int64 Int64 Error Error Error
Ptr Error Error Error Error Error Error Error Error
undefined Error Error Error Error Error Error Error Error
Array Error Error Error Error Error Error Error Error

 

Multiply (*) Real Bool String Int32 Int64 Ptr undefined Array
Real Real Real String Real Real Error Error Error
Bool Real Real Error Real Real Error Error Error
String Error Error Error Error Error Error Error Error
Int32 Real Real String Int32 Int64 Error Error Error
Int64 Real Real Error Int64 Int64 Error Error Error
Ptr Error Error Error Error Error Error Error Error
undefined Error Error Error Error Error Error Error Error
Array Error Error Error Error Error Error Error Error

 

Divide (/) Real Bool String Int32 Int64 Ptr undefined Array
Real Real Real Error Real Real Error Error Error
Bool Real Real Error Real Real Error Error Error
String Error Error Error Error Error Error Error Error
Int32 Real Real Error Int32 Int64 Error Error Error
Int64 Real Real Error Int64 Int64 Error Error Error
Ptr Error Error Error Error Error Error Error Error
undefined Error Error Error Error Error Error Error Error
Array Error Error Error Error Error Error Error Error

 

Divide (div) Real Bool String Int32 Int64 Ptr undefined Array
Real Real Real Error Real Real Error Error Error
Bool Real Real Error Real Real Error Error Error
String Error Error Error Error Error Error Error Error
Int32 Real Real Error Int32 Int64 Error Error Error
Int64 Real Real Error Int64 Int64 Error Error Error
Ptr Error Error Error Error Error Error Error Error
undefined Error Error Error Error Error Error Error Error
Array Error Error Error Error Error Error Error Error

 

Mod (%) Real Bool String Int32 Int64 Ptr undefined Array
Real Real Real Error Real Real Error Error Error
Bool Real Real Error Real Real Error Error Error
String Error Error Error Error Error Error Error Error
Int32 Real Real Error Int32 Int64 Error Error Error
Int64 Real Real Error Int64 Int64 Error Error Error
Ptr Error Error Error Error Error Error Error Error
undefined Error Error Error Error Error Error Error Error
Array Error Error Error Error Error Error Error Error

 

Equality Table

There are a few special constants that may or may not be equal to themselves, as shown in the following table:

Equality (==) NaN undefined infinity
NaN false false false
undefined false true false
infinity false false true

 

 

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