$JUSTIFY
Synopsis
$JUSTIFY(expression,width,decimal) $J(expression,width,decimal)
Parameters
Argument  Description 

expression  The value that is to be rightaligned. It can be a numeric value, a string literal, the name of a variable, or any valid ObjectScript expression. 
width  The number of characters within which expression is to be rightaligned. A positive integer or an expression that evaluates to a positive integer. 
decimal  Optional — The number of fractional digits. A positive integer or an expression that evaluates to a positive integer. Caché rounds or pads the number of fractional digits in expression to this value. If you specify decimal, Caché treats expression as a numeric. 
Description
$JUSTIFY returns the value specified by expression rightaligned within the specified width. You can include the decimal parameter to decimalalign numbers within width.

$JUSTIFY(expression,width): the 2parameter syntax rightjustifies expression within width. It does not perform any conversion of expression. The expression can be a numeric or a nonnumeric string.

$JUSTIFY(expression,width,decimal): the 3parameter syntax converts expression to a canonical number, rounds or zero pads fractional digits to decimal, then rightjustifies the resulting numeric value within width. If expression is a nonnumeric string, Caché converts it to 0, pads it, then rightjustifies it.
$JUSTIFY recognizes the DecimalSeparator character for the current locale. It adds or deletes a DecimalSeparator character as needed. The DecimalSeparator character depends upon the locale; commonly it is either a period (.) for Americanformat locales, or a comma (,) for Europeanformat locales. To determine the DecimalSeparator character for your locale, invoke the following method:
WRITE ##class(%SYS.NLS.Format).GetFormatItem("DecimalSeparator")
Commonly, $JUSTIFY is used to format numbers with fractional digits: every number is given the same number of fractional digits, and the numbers are rightaligned so that the DecimalSeparator characters align in a column of numbers. $JUSTIFY is especially useful for outputting formatted values using the WRITE command.
Parameters
expression
The value to be rightjustified, and optionally expressed as a numeric with a specified number of fractional digits.

If string justification is desired, do not specify decimal. The expression can contain any characters. $JUSTIFY rightjustifies expression, as described in width. You can specify the null string ("") to create a string of blank spaces of the specified width.

If numeric justification is desired, specify decimal. If decimal is specified, $JUSTIFY converts expression to a canonical number. It resolves leading plus and minus signs and removes leading and trailing zeros. It truncates expression at the first nonnumeric character. If expression begins with a nonnumeric character (such as a currency symbol), $JUSTIFY converts the expression value to 0. For further details on how Caché converts a numeric to a canonical number, and Caché handling of a numeric string containing nonnumeric characters, refer to the Numbers section of the “Data Types and Values” chapter of Using Caché ObjectScript.
After $JUSTIFY converts expression to a canonical number, it zeropads or rounds this canonical number to decimal number of fractional digits, then rightjustifies the result, as described in width. $JUSTIFY does not recognize NumericGroupSeparator characters, currency symbols, multiple DecimalSeparator characters, or trailing plus or minus signs.
width
The width in which to rightjustify the converted expression. If width is greater than the length of expression (after numeric and fractional digit conversion), Caché rightjustifies to width, leftpadding as needed with blank spaces. If width is less than the length of expression (after numeric and fractional digit conversion), Caché sets width to the length of the expression value.
Specify width as a positive integer. A width value of 0, the null string (""), or a nonnumeric string is treated as a width of 0, which means that Caché sets width to the length of the expression value.
decimal
The number of fractional digits. If expression contains more fractional digits, $JUSTIFY rounds the fractional portion to this number of fractional digits. If expression contains fewer fractional digits, $JUSTIFY pads the fractional portion with zeros to this number of fractional digits, adding a Decimal Separator character, if needed. If decimal=0, $JUSTIFY rounds expression to an integer value and deletes the Decimal Separator character.
If the expression value is less than 1, $JUSTIFY inserts a leading zero before the DecimalSeparator character.
The $DOUBLE values INF, INF, and NAN are returned unchanged by $JUSTIFY, regardless of the decimal value.
$JUSTIFY and $FNUMBER
You can use $FNUMBER to format a number for display. Both $JUSTIFY and $FNUMBER can round (or zero pad) to a specified number of fractional digits. $FNUMBER can also be used to add NumericGroupSeparator characters. However, note the following:

$FNUMBER cannot format a number once it has been rightaligned using $JUSTIFY. ($FNUMBER interprets the leading spaces as nonnumeric characters.)

$JUSTIFY cannot perform numeric justification on a number once you have added NumericGroupSeparator characters or have prepended a currency symbol. ($JUSTIFY interprets NumericGroupSeparators or currency symbols as nonnumeric characters.)
Therefore, to properly add NumericGroupSeparators, round fractional digits, prepend a currency symbol, and rightalign the resulting number, you use $FNUMBER to perform rounding and inserting of NumericGroupSeparators. You then use $JUSTIFY with 2parameter syntax to rightalign the resulting string:
SET num=123456.789
SET fmtnum=$FNUMBER(num,",",2)
SET money="$"_fmtnum
SET rmoney=$JUSTIFY(money,15)
WRITE ">",rmoney,"<"
Examples
The following example performs rightjustification on strings. No numeric conversion is performed:
WRITE ">",$JUSTIFY("right",10),"<",!
WRITE ">",$JUSTIFY("aligned",10),"<",!
WRITE ">",$JUSTIFY("+0123.456",10),"<",!
WRITE ">",$JUSTIFY("string longer than width",10),"<",!
The following example performs numeric rightjustification with a specified number of fractional digits:
SET var1 = 250.50999
SET var2 = 875
WRITE !,$JUSTIFY(var1,20,2),!,$JUSTIFY(var2,20,2)
WRITE !,$JUSTIFY("_________",20)
WRITE !,$JUSTIFY("TOTAL",9),$JUSTIFY(var1+var2,11,2)
return the following lines:
250.51 875.00 _______ TOTAL 1125.51
The following example performs numeric rightjustification with the $DOUBLE values INF and NAN:
SET rtn=##class(%SYSTEM.Process).IEEEError(0)
SET x=$DOUBLE(1.2e500)
WRITE !,"Double: ",x
WRITE !,">",$JUSTIFY(x,12,2),"<"
SET y=$DOUBLE(xx)
WRITE !,"Double INF minus INF: ",y
WRITE !,">",$JUSTIFY(y,12,2),"<"