Which of the following is true for variable names in C?

Which of the following is true for variable names in C?

They can contain alphanumeric characters as well as special characters

It is not an error to declare a variable to be one of the keywords(like goto, static)

Variable names cannot start with a digit

Variable can be of any length

Answer : C

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1) What is the problem in following variable declaration?
float 3Bedroom-Hall-Kitchen?;

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

Compiler and linker implementations

Assemblers and loaders implementations

C language

None

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

int number;

float rate;

int variable_count;

int $main;

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) Which is valid C expression?

int my_num = 100,000;

int my_num = 100000;

int my num = 1000;

int $my_num = 10000;