Determine which of the following are valid identifiers. If invalid, explain why.(a) r e c o r d 1 ( e ) $ t a x ( h ) name-and-address(b) l r e c o r d cr) name (i) name-and-address(c) f i l e - 3 (g) name and address (j) 123 - 45 - 6789(6) r e t u r n
Question
Determine which of the following are valid identifiers. If invalid, explain why.(a) r e c o r d 1 ( e ) $ t a x ( h ) name-and-address(b) l r e c o r d cr) name (i) name-and-address(c) f i l e - 3 (g) name and address (j) 123 - 45 - 6789(6) r e t u r n
Solution
(a) r e c o r d 1: Valid identifier. It consists of alphabetic characters and a numeric digit.
(e): Invalid identifier. It consists of only a single character, which is not allowed.
$ t a x: Invalid identifier. It starts with a special character, which is not allowed.
(h): Invalid identifier. It consists of only a single character, which is not allowed.
name-and-address: Valid identifier. It consists of alphabetic characters and a hyphen.
(b) l r e c o r d cr: Invalid identifier. It contains a space, which is not allowed.
name: Valid identifier. It consists of alphabetic characters.
(i): Invalid identifier. It consists of only a single character, which is not allowed.
name-and-address: Valid identifier. It consists of alphabetic characters and a hyphen.
(c) f i l e - 3: Invalid identifier. It contains a space and a hyphen, which are not allowed.
(g): Invalid identifier. It consists of only a single character, which is not allowed.
(j) 123 - 45 - 6789: Invalid identifier. It contains spaces and hyphens, which are not allowed.
(6): Invalid identifier. It consists of only a single digit, which is not allowed.
r e t u r n: Valid identifier. It consists of alphabetic characters.
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