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 is valid C expression?

int my_num = 100,000;

int my_num = 100000;

int my num = 1000;

int $my_num = 10000;

3) All keywords in C are in

LowerCase letters

UpperCase letters

CamelCase letters

None

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

int number;

float rate;

int variable_count;

int $main;

5) In case of ordinary int variables:

The leftmost bit is reserved for sign

The rightmost bit is reserved for sign

No bit is reserved for sign

None of the above