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

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

int number;

float rate;

int variable_count;

int $main;

Answer : D

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

2) 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

3) Variable name resolving (number of significant characters for uniqueness of variable) depends on

Compiler and linker implementations

Assemblers and loaders implementations

C language

None

4) The declaration "unsigned u" indicates:

u is an unsigned character

u is an unsigned integer

u is a character

None of the above

5) All keywords in C are in

LowerCase letters

UpperCase letters

CamelCase letters

None