Answer Posted / aditya

is_defined : Tests whether an expression results in a non-
NULL value.

Syn :long is_defined(expr)


is_null :Tests whether an expression results in a NULL
value.

Syntax : long is_null(expr)



is_blank : Tests whether a string contains only blank
characters.

Syntax : long is_blank(string str)

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1067

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1207

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996

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1031

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2159

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1457

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1040

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Pdl with an example?

1048

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1415

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