A character literal is any string of characters enclosed in quotation marks as shown in the following example: ‘This is a character string.’ “This is a character string, too.” For convenience, you can enter character literals without the delimiting quotation marks; however, quotation marks are required in some situations. The rules for using quotation marks…
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A null string is a character string of zero length. Unlike the $Null property that indicates that the value is unknown or unassigned, the null string is a known value. For example, if you have two variables, x and y, both of which are null strings, then the expression x = ” and y ‘abc’…
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Certain characters, such as quotation marks and the backslash, have special functions in the software. If you need to use one of these metacharacters as a literal character in a string, you must “escape” the special function by inserting a backslash ( – Escape) preceding the metacharacter as shown in the following example: ‘This is…
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If you need a place a character not normally available from the keyboard into a character literal, use the backslash to create the hex code for that character as shown in the following example: ‘This string has an ASCII escape generated by hex 1B (1B)’ The two characters immediately following a quoted backslash are treated…
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A character literal is any string of characters enclosed in quotation marks as shown in the following example: ‘This is a character string.’ “This is a character string, too.” For convenience, you can enter character literals without the delimiting quotation marks; however, quotation marks are required in some situations. The rules for using quotation marks…
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