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

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

int number;

float rate;

int variable_count;

int $main;

Answer : D

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1) All keywords in C are in

LowerCase letters

UpperCase letters

CamelCase letters

None

2) 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

3) The declaration "unsigned u" indicates:

u is an unsigned character

u is an unsigned integer

u is a character

None of the above

4) 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

5) Variable name resolving (number of significant characters for uniqueness of variable) depends on

Compiler and linker implementations

Assemblers and loaders implementations

C language

None