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1. [10pts] Indicate which of the following identifiers are valid C identifiers. (a) 37nights (b) give_me_1dollar...

1. [10pts] Indicate which of the following identifiers are valid C identifiers.

(a) 37nights

(b) give_me_1dollar

(c) AChristmasCarrol_Type

(d) -name_Var

(e) mainVar

(f) _temporaryVariable

(g) 3rdStreet

(h) MultiplyBy3

(i) apartment#

(j) int

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Answer #1 
(a) 37nights
Invalid, identifiers should not starts with digits

(b) give_me_1dollar
Valid

(c) AChristmasCarrol_Type
Valid

(d) -name_Var
Invalid, identifiers should not starts with -

(e) mainVar
Valid

(f) _temporaryVariable
Valid

(g) 3rdStreet
Invalid, identifiers should not starts with digits

(h) MultiplyBy3
Valid

(i) apartment#
Invalid, identifiers should not contains special characters like #

(j) int
We should not use builtin keywords for identifiers

So, valid C identifiers are
(b) give_me_1dollar
(c) AChristmasCarrol_Type
(e) mainVar
(f) _temporaryVariable
(h) MultiplyBy3
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