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

2) All keywords in C are in

LowerCase letters

UpperCase letters

CamelCase letters

None

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

int number;

float rate;

int variable_count;

int $main;

4) 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

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

float PI = 3.14;

double PI = 3.14;

int PI = 3.14;

#define PI 3.14