Which is valid C expression?

Which is valid C expression?

int my_num = 100,000;

int my_num = 100000;

int my num = 1000;

int $my_num = 10000;

Answer : B

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1) 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

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

volatile

true

friend

export

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

int number;

float rate;

int variable_count;

int $main;

4) All keywords in C are in

LowerCase letters

UpperCase letters

CamelCase letters

None

5) 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

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