Constants in expressions

Type

Instructions

TrueFalse

Enter "true" or "false" or "T" or "F."

In most cases, such properties appear as a check box or radio buttons. Avoid the null value "" for a TrueFalse property; in many but not all settings, it is the same as "false".

Text

Enter two double quotes for the null string.

For normal text, enter printable characters (other than double quotes) between two double quotes. You can include single quotes within the double quotes.

Use the two character sequence \" to include a double quote.

Use Java character escapes to include tab characters (\t), backspace (\b), newline (\n), form feed (\f), carriage return (\r), backslash (\\), and \zzz for the Latin-1 character identified by the octal value zzz, between 000 and 377.

Identifier

Enter a text value not containing double quote characters, newline characters, or carriage return characters.

Integer

Enter digits 0-9 and an optional plus or minus sign. Do not include commas or a decimal point.

Enter pairs of hex digits (0 to F) preceded by 0x. for a hexadecimal value.

Decimal

Enter any number of decimal digits, a single comma or period, and additional decimal digits. Don't include more than one punctuation mark. Don't start a value with a period; use a leading zero.

Password

Use any non-blank printable character. Don't include spaces or control characters. Case is significant.

Date

When a date constant appears alone in an expression, include double quotes to prevent the value from being interpreted as an integer.

Enter two or four digits for the year, two digits for the month, two digits for the day.

If the year contains two digits, the system uses an algorithm to determine a "reasonable" century based on the current date. During 2006, the system prefers dates between 1997 and 2097.

The valid expression

12/10/2006

is an expression involving two divisions and three integers, whereas

"12/10/2006"

is an American-style date.

The empty string and "" are equivalent to "19700101" or January 1, 1970. In settings where this is not desirable, processing can test for and block this date value.

Double

Enter an optional sign, digits, decimal point, digits, the letter E and an exponent. All parts of the literal are optional except for the decimal point and one digit.

DateTime

Enter a value using this pattern: yyyyMMddtHHmmss.SSS zzz. Enter:

• Two or four digits for the year
• Two digits for the month
• Two digits for the day
• The single T (or t or period . or comma ,)
• Two digits for the hour
• Two digits for the minutes
• Two digits for the seconds
• A period
• Three digits for the milliseconds
• One space
• The literal GMT for the zone.

The year, month, and day are required.

Separate the date and time portions of the value with either T, t, a single space, or a punctuation mark such as a period or a comma.

If you include milliseconds, separate the seconds from the milliseconds with either a period (.) or a comma (,). Use the GMT time zone only.

The time portion is optional. If you omit the time portion, follow the guidelines above for Date constants, by enclosing the value within parentheses.

If the year contains only two digits, the system uses an algorithm to determine a "reasonable" century based on the current date. During 2007, the system prefers dates between 1998 and 2098.

Time of Day

Enter two digits for the hour, from 00 to 23. Optionally, enter two digits for the minute, from 00 to 59. If you include six digits, the system interprets the last two as seconds. You can include an optional colon to separate the segments of this value. Do not enter a time zone.