Numbers

Integers and floats to rule the world!

There are two basic kinds of numbers in CFML: integers (whole numbers) and floats (have a decimal point). Internally, each CFML engine treats them uniquely and backs up each numerical value as a Java class: java.lang.Double or java.lang.Integer.

Type	Size (bits)	Min Value	Max Value
Integer	32	-2,147,483,648 (-231)	2,147,483,647 (231 - 1)

Type	Size (bits)	Significant Bits	Exponent Bits	Decimal Digits
Double	64	53	11	15-16

Lucee stores all numerical values as Doubles

Adobe stores integers as Integer and floats as Doubles

Tip: If you are dealing with currency or tracking precision, please read about precisionEvaluate() to represent big numbers and precision results: https://cfdocs.org/precisionevaluate

a = 1;
b = 50.1;
writeOutput( a * b );

Also, note that CFML will do the auto-casting for you when converting between integers and doubles.

Numeric Type

Once we start looking at functions/closures and lambdas, you will see that you can also type the incoming arguments and results of functions. You also won't need to type it with integer or float, just as numeric:

numeric function add( numeric a, numeric b ){
    return a + b;
}

Operators & Functions

CFML offers tons of mathematical operators and functions: https://cfdocs.org/math%2Dfunctions

abs	aCos	arrayAvg
arraySum	aSin	atn
bitAnd	bitMaskClear	bitMaskRead
bitMaskSet	bitNot	bitOr
bitSHLN	bitSHRN	bitXor
ceiling	cos	decrementValue
expt	fix	floor
formatBaseN	incrementValue	inputBaseN
int	log	log10
max	min	pi
precisionEvaluate	rand	randomize
randRange	round	sgn
sin	sqr	tan

Casting/Parsing

CFML also has a toNumeric() function that you can use to cast a value to a number using different radixes.

toNumeric( "29.5" )
toNumeric( "FF0011", "hex" )
toNumeric( "1010", "bin" )

The parseNumber() is also used to convert a string number into a numeral system (https://cfdocs.org/parsenumber)

In a positional numeral system, the radix or base is the number of unique digits, including the digit zero, used to represent numbers. For example, for the decimal system (the most common system in use today) the radix is ten, because it uses the ten digits from 0 through 9.

Is it a number?

CFML provides the isNumeric() function to determine if the passed value can be converted to a numeric value.

isNumeric( 23 ) // yes
isNumeric( "twenty" ) // no
isNumeric( 5e2 ) // yes

Repeating Instructions

Number variables can be used to repeat instructions. Like in many other languages, CFML supports the for, while and loop constructs:

for( var i = 0; i <= 10; i++ ){
    writeOutput( "Showing day " & i );
}

i =1;
while( i <= 10 ){
    writeOutput( "Showing day " & i++ );
}

Please note that the syntax varies from tag to script, so refer to the docs for subtle differences. Please also note that you can iterate over structures, arrays, queries, and objects in CFML; we will see this in later sections.

See https://cfdocs.org/cfloop, https://cfdocs.org/cfwhile for more information