Which of the following is not a valid variable name declaration?

Which of the following is not a valid variable name declaration?

int _a3;

int a_3;

int 3_a;

int _3a

Answer : C

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1) The declaration "unsigned u" indicates:

u is an unsigned character

u is an unsigned integer

u is a character

None of the above

2) All keywords in C are in

LowerCase letters

UpperCase letters

CamelCase letters

None

3) A constant cannot be used except:

For assigning initial value to a variable

With ++ operator

As a formal argument

On LHS of an assignment operator

4) Which of following is not a valid name for a C variable?

study2online

study2 online

study2online1

none

5) Which of the following is not a valid C variable name?

int number;

float rate;

int variable_count;

int $main;