161. Comment on the following pointer declaration.
     

     int *p, n;
     

1. 1. p and n both are not pointers to integer

   
   
   

   2. p is a pointer to integer, n may or may not be

   
   
   

   3. p and n, both are pointers to integer

   
   
   

   4. p is a pointer to integer, n is not

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   p is a pointer to integer, n is not

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

      #include <stdio.h>
         int *fun();
         int main()
         {
             int *ptr = fun();
             printf("%d\n", *ptr);
         }
         int *fun()
         {
             int n = 12;
             return &n;
         }
     

1. 1. Segmentation fault

   
   
   

   2. Undefined behaviour

   
   
   

   3. Compilation Error

   
   
   

   4. 12

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   Segmentation fault

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

     #include <stdio.h>
         int *fun();
         int main()
         {
             int *ptr = fun();
             printf("%d\n", *ptr);
         }
         int *fun()
         {
             int *p = (int*)malloc(sizeof(int));
             *p = 11;
             return p;
         }
     

1. 1. Compilation Error

   
   
   

   2. 11

   
   
   

   3. Undefined behaviour

   
   
   

   4. Segmentation fault/runtime crash since pointer to local variable is returned

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   11

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

      #include <stdio.h>
         int main()
         {
             int num = 110;
             void *ptr = #
             printf("%f\n", *(float*)ptr);
             return 0;
         }
     

1. 1. 110

   
   
   

   2. Undefined behaviour

   
   
   

   3. Garbage value

   
   
   

   4. Compilation Error

   
   
   

   5. 0.000000

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: E

   0.000000

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

     #include <stdio.h>
         int main()
         {
             int n = 12;
             void *ptr = &n;
             printf("%d\n", (int)*ptr);
             return 0;
         }
     

1. 1. Compilation Error

   
   
   

   2. Garbage value

   
   
   

   3. 12

   
   
   

   4. Nothing

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   Compilation Error
   

   main.c: In function ‘main’:
   main.c:6:29: warning: dereferencing ‘void *’ pointer
            printf("%d\n", (int)*ptr);
                                ^~~~
   main.c:6:24: error: invalid use of void expression
            printf("%d\n", (int)*ptr);
   

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