C Programming Questions and Answers – Pointer to Structures – 1

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Pointer to Structures – 1”.

Pre-requisite for this C MCQ set: Advanced C Programming Video Tutorial.

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

  1.     #include <stdio.h>
  2.     struct p
  3.     {
  4.         int x;
  5.         char y;
  6.     };
  7.     int main()
  8.     {
  9.         struct p p1[] = {1, 92, 3, 94, 5, 96};
  10.         struct p *ptr1 = p1;
  11.         int x = (sizeof(p1) / 3);
  12.         if (x == sizeof(int) + sizeof(char))
  13.             printf("%d\n", ptr1->x);
  14.         else
  15.             printf("falsen");
  16.     }

a) Compile time error
b) 1
c) Undefined behaviour
d) false
View Answer

Answer: d
Explanation: None.
advertisement
advertisement

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

Sanfoundry Certification Contest of the Month is Live. 100+ Subjects. Participate Now!
  1.     #include <stdio.h>
  2.     struct p
  3.     {
  4.         int x;
  5.         char y;
  6.     };
  7.     int main()
  8.     {
  9.         struct p p1[] = {1, 92, 3, 94, 5, 96};
  10.         struct p *ptr1 = p1;
  11.         int x = (sizeof(p1) / sizeof(ptr1));
  12.         if (x == 1)
  13.             printf("%d\n", ptr1->x);
  14.         else
  15.             printf("false\n");
  16.     }

a) Compile time error
b) 1
c) false
d) Undefined behaviour
View Answer

Answer: c
Explanation: None.
advertisement

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

  1.     #include <stdio.h>
  2.     struct p
  3.     {
  4.         int x;
  5.         char y;
  6.     };
  7.     typedef struct p* q*;
  8.     int main()
  9.     {
  10.         struct p p1[] = {1, 92, 3, 94, 5, 96};
  11.         q ptr1 = p1;
  12.         printf("%d\n", ptr1->x);
  13.     }

a) Compile time error
b) 1
c) Undefined behaviour
d) Segmentation fault
View Answer

Answer: a
Explanation: None.
advertisement

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

  1.     #include <stdio.h>
  2.     struct p
  3.     {
  4.         int x;
  5.         char y;
  6.     };
  7.     void foo(struct p* );
  8.     int main()
  9.     {
  10.         typedef struct p* q;
  11.         struct p p1[] = {1, 92, 3, 94, 5, 96};
  12.         foo(p1);
  13.     }
  14.     void foo(struct p* p1)
  15.     {
  16.         q ptr1 = p1;
  17.         printf("%d\n", ptr1->x);
  18.     }

a) Compile time error
b) 1
c) Segmentation fault
d) Undefined behaviour
View Answer

Answer: a
Explanation: None.

5. Which of the following is an incorrect syntax for pointer to structure?

(Assuming struct temp{int b;}*my_struct;)

a) *my_struct.b = 10;
b) (*my_struct).b = 10;
c) my_struct->b = 10;
d) Both *my_struct.b = 10; and (*my_struct).b = 10;
View Answer

Answer: a
Explanation: None.

6. Which of the following is an incorrect syntax to pass by reference a member of a structure in a function?

(Assume: struct temp{int a;}s;)

a) func(&s.a);
b) func(&(s).a);
c) func(&(s.a));
d) none of the mentioned
View Answer

Answer: d
Explanation: None.

7. Which of the following structure declaration doesn’t require pass-by-reference?
a)

   struct{int a;}s;
   main(){}

b)

   struct temp{int a;};
   main(){
       struct temp s;
   }

c)

   struct temp{int a;};
   main(){}
   struct temp s;

d) none of the mentioned
View Answer

Answer: d
Explanation: None.

8. Which option is not possible for the following function call?

  1. func(&s.a); //where s is a variable of type struct and a is the member of the struct.

a) Compiler can access entire structure from the function
b) Individual member’s address can be displayed in structure
c) Individual member can be passed by reference in a function
d) None of the mentioned
View Answer

Answer: a
Explanation: None.

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

  1.     #include <stdio.h>
  2.     struct temp
  3.     {
  4.         int a;
  5.     } s;
  6.     void change(struct temp);
  7.     main()
  8.     {
  9.         s.a = 10;
  10.         change(s);
  11.         printf("%d\n", s.a);
  12.     }
  13.     void change(struct temp s)
  14.     {
  15.         s.a = 1;
  16.     }

a) Output will be 1
b) Output will be 10
c) Output varies with machine
d) Compile time error
View Answer

Answer: b
Explanation: None.

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

  1.  #include <stdio.h>
  2.     struct p
  3.      {
  4.         int x;
  5.         int y;
  6.     };
  7.     int main()
  8.     {
  9.         struct p p1[] = {1, 92, 3, 94, 5, 96};
  10.         struct p *ptr1 = p1;
  11.         int x = (sizeof(p1) / 5);
  12.         if (x == 3)
  13.             printf("%d %d\n", ptr1->x, (ptr1 + x - 1)->x);
  14.         else
  15.             printf("false\n");
  16.     }

a) Compile time error
b) 1 5
c) Undefined behaviour
d) false
View Answer

Answer: d
Explanation: None.

Sanfoundry Global Education & Learning Series – C Programming Language.

To practice all areas of C language, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

advertisement
advertisement
Subscribe to our Newsletters (Subject-wise). Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs!

Youtube | Telegram | LinkedIn | Instagram | Facebook | Twitter | Pinterest
Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

Subscribe to his free Masterclasses at Youtube & discussions at Telegram SanfoundryClasses.