Which of the following cannot be a variable name in C?

Which of the following cannot be a variable name in C?

volatile

true

friend

export

Answer : A

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

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

int _a3;

int a_3;

int 3_a;

int _3a

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) Variable names beginning with underscore is not encouraged. Why?

It is not standardized

To avoid conflicts since assemblers and loaders use such names

To avoid conflicts since library routines use such names

To avoid conflicts with environment variables of an operating system