26. What will be the output of the following C code?
    

    #include <stdio.h>
        int *ptr;
        int main()
        {
            if (ptr == NULL)
                printf("Right\n");
            return 0;
        }
    

1. 1. Right only if NULL value is 0

   
   
   

   2. Compilation Error

   
   
   

   3. Nothing

   
   
   

   4. Right

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   Right

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27. What will be the output of the following C code?
    

    #include <stdio.h>
        int *p;
        int main()
        {
            if (p == 0)
                printf("Hey\n");
            return 0;
        }
    

1. 1. Hey

   
   
   

   2. Compilation Error

   
   
   

   3. Hey only if NULL value is 0

   
   
   

   4. Nothing

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   Hey only if NULL value is 0

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28. Which of the following statement is false?

1. 1. A variable must be declared and defined at the same time

   
   
   

   2. A variable defined once can be defined again with different scope

   
   
   

   3. A variable refers to a location in memory

   
   
   

   4. A single variable cannot be defined with two different types in the same scope

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   It is not an error if the variable is declared and not defined. For example – extern declarations.

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29. What will be the output of the following C code?
    

    #include <stdio.h>
        int n;
        int main()
        {
            extern int n;
            if (p == 0)
                printf("Scope rules follow here\n");
        }
    

1. 1. Scope rules followed

   
   
   

   2. Nothing will be printed as value of n is not zero because i is an automatic variable

   
   
   

   3. Compile time error due to multiple declaration

   
   
   

   4. Compile time error due to not defining type in statement extern n

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   Scope rules followed

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30. What will be the output of the following C code (without linking the source file in which arrayA is defined)?
    

    #include <stdio.h>
        int main()
        {
            extern arrayA[];
            printf("Interview Mania\n");
        }
    

1. 1. Linking error due to undefined reference

   
   
   

   2. Compile time error because datatype of array is not provided

   
   
   

   3. Compile time error because size of array is not provided

   
   
   

   4. Interview Mania

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   Interview Mania

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