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

2) 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

3) A declaration "short int" is used for variable

Which have short duration in a program

Which have short names

Which may require less storage than normal integers

All of the above

4) All keywords in C are in

LowerCase letters

UpperCase letters

CamelCase letters

None

5) Which is valid C expression?

int my_num = 100,000;

int my_num = 100000;

int my num = 1000;

int $my_num = 10000;