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.:

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

Type Tables

Equality Table

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