51. Which of the following format identifier can never be used for the variable var?
    

    #include <stdio.h>
        int main()
        {
            char *variable = "Advanced Training in C by interviewmania.com";
        }
    

1. 1. %s

   
   
   

   2. %c

   
   
   

   3. %d

   
   
   

   4. %f

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   %c can be used to print the indexed position.
   %d can still be used to display its ASCII value.
   %s is recommended.
   %f cannot be used for the variable var.

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52. Which of the following declaration is not supported by C?

1. 1. String str;

   
   
   

   2. float str = 4e3;

   
   
   

   3. Both String str; & float str = 4e3;

   
   
   

   4. char *str;

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   It is legal in Java, but not in C.

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53. Which of the following cannot be a variable name in C?

1. 1. export

   
   
   

   2. friend

   
   
   

   3. volatile

   
   
   

   4. true

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   volatile is C keyword.

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

    #include <stdio.h>
        void fun(const int *);
        int main()
        {
            const int k = 12;
            printf("%d ", k);
            fun(&k);
            printf("%d", k);
     
        }
        void fun(const int *k)
        {
            *k = 21;
        }
    

1. 1. 12 21

   
   
   

   2. 21 12

   
   
   

   3. Runtime Error

   
   
   

   4. Compilation Error

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   Cannot change a const type value.

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

    #include <stdio.h>
        int main()
        {
            const int k = 11;
            int *p = &k;
            *p = 22;
            printf("%d\n", k);
            return 0;
        }
    

1. 1. 11

   
   
   

   2. Compilation Error

   
   
   

   3. 22

   
   
   

   4. Runtime Error

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   Changing const variable through non-constant pointers invokes compiler warning.

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