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

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

Answer : D

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

2) 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

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) 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

5) 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