16. calloc() initialize memory with all bits set to zero.
    

1. 1. Depends on the standard

   
   
   

   2. Depends on the compiler

   
   
   

   3. False

   
   
   

   4. True

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   True

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17. What if size is zero in the following C statement?
    

    realloc(ptr, size)
    

1. 1. Doesn’t do any reallocation of ptr i.e. no operation

   
   
   

   2. Undefined behaviour

   
   
   

   3. Allocate a memory location with zero length

   
   
   

   4. Free the memory pointed to by ptr

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   Free the memory pointed to by ptr

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18. Which of the following storage class supports char data type?

1. 1. auto

   
   
   

   2. register

   
   
   

   3. static

   
   
   

   4. All of above

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   char data type is supported by all storage classes i.e. auto, register and static.

   Correct Option: D

   char data type is supported by all storage classes i.e. auto, register and static.

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19. What will be the output of the program:-

    extern int i = 5;
    main()
    (
    int i=7;
    printf("%d",i);
    }
    

1. 1. 5

   
   
   

   2. compiler error

   
   
   

   3. 7

   
   
   

   4. garbage value

   
   
   

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1. View Hint View Answer Discuss in Forum

   variable declared with extern keyword has scope throughout the file, it is a global variable.
   variable declared within the function is local to the function in which it is declared.

   Correct Option: C

   printf function prints value of i, which is local to the function in which it is declared.

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