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1. C99 standard guarantees uniqueness of __________ characters for internal names.
Choose the correct option:

  • a) 31

  • b) 63

  • c) 12

  • d) 14

ISO C99 compiler may consider only first 63 characters for internal names.

2. C99 standard guarantees uniqueness of ___________ characters for external names.
Choose the correct option:

  • a) 31

  • b) 6

  • c) 12

  • d) 14

ISO C99 compiler may consider only first 31 characters for external names.

3. Which of the following is not a valid variable name declaration?
Choose the correct option:

  • a) int __a3;

  • b) int __3a;

  • c) int __A3;

  • d) None of the mentioned

None.

4. Which of the following is not a valid variable name declaration?
Choose the correct option:

  • a) int _a3;

  • b) int a_3;

  • c) int 3_a;

  • d) int _3a;

Variable name cannot start with a digit.

5. Why do variable names beginning with the underscore is not encouraged?
Choose the correct option:

  • 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

None.

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