41. C99 standard guarantees uniqueness of _____ characters for external names.

1. 1. 12

   
   
   

   2. 6

   
   
   

   3. 14

   
   
   

   4. 31

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

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

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

1. 1. int __B11;

   
   
   

   2. int __11b;

   
   
   

   3. int __b11;

   
   
   

   4. All of above

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: E

   int a = 12; is a valid variable name declaration.

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43. What is the problem in following variable declaration?
    

    float 2B-H-K?;
    

1. 1. The special character ‘-‘

   
   
   

   2. The special character ‘?’

   
   
   

   3. The variable name begins with an integer

   
   
   

   4. All of above

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   A variable name cannot start with an integer, along with that the C compiler interprets the ‘-‘ and ‘?’ as a minus operator and a question mark operator respectively.

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44. Why do variable names beginning with the underscore is not encouraged?

1. 1. To avoid conflicts with environment variables of an operating system

   
   
   

   2. It is not standardized

   
   
   

   3. To avoid conflicts since assemblers and loaders use such names

   
   
   

   4. To avoid conflicts since library routines use such names

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   To avoid conflicts since library routines use such names

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45. All keywords in C are in ____________.

1. 1. CamelCase letters

   
   
   

   2. LowerCase letters

   
   
   

   3. UpperCase letters

   
   
   

   4. All of above

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   LowerCase letters

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