Q1. Which of the following is true for variable names in C?
a) They can contain alphanumeric characters as well as special characters
b) It is not an error to declare a variable to be one of the keywords(like
goto, static)
c) Variable names cannot start with a digit
d) Variable can be of any length
Answer: c
Explanation: According to the syntax for C variable name, it cannot start with
a digit.
Q2. Which of the following is not a valid C variable name?
a) int number;
b) float rate;
c) int variable count;
d) int $main;
Answer: d
Explanation: Since only underscore and no other special character is allowed in
a variable name, it results in an error.
Q3. Variable name resolution (number of significant
characters for the uniqueness of variable) depends on ___________
a) Compiler and linker implementations
b) Assemblers and loaders implementations
c) C language
d) None of the mentioned
Answer: a
Explanation: It depends on the standard to which compiler and linkers are
adhering.
Q4. All keywords in C are in ____________
a) LowerCase letters
b) UpperCase letters
c) CamelCase letters
d) None of the mentioned
Answer: a
Explanation: None.
Q5. Why do variable names beginning with the
underscore is not encouraged?
a) It is not standardized
b) To avoid conflicts since assemblers and loaders use such names
c) To avoid conflicts since library routines use such names
d) To avoid conflicts with environment variables of an operating system
Answer: c
Explanation: None.
Q6. Which of the following is not a valid variable
name declaration?
a) int _a3;
b) int a_3;
c) int 3_a;
d) int _3a
Answer: c
Explanation: Variable name cannot start with a digit.
Q7. Which of the following is not a valid variable name
declaration?
a) int __a3;
b) int __3a;
c) int __A3;
d) None of the mentioned
Answer: d
Explanation: None.
Q8. C99 standard
guarantees uniqueness of ___________ characters for external names.
a) 31
b) 6
c) 12
d) 14
Answer: a
Explanation: ISO C99 compiler may consider only first 31 characters for
external names.
Q9. C99 standard guarantees uniqueness of __________
characters for internal names.
a) 31
b) 63
c) 12
d) 14
Answer: b
Explanation: ISO C99 compiler may consider only first 63 characters for internal