C Pointer to Structures Questions and Answers

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?

```
    #include <stdio.h>
```
```
    struct p
```
```
    {
```
```
        int x;
```
```
        char y;
```
```
    };
```
```
    int main()
```
```
    {
```

        struct p p1[] = {1, 92, 3, 94, 5, 96};

```
        struct p *ptr1 = p1;
```
```
        int x = (sizeof(p1) / 3);
```

        if (x == sizeof(int) + sizeof(char))

```
            printf("%d\n", ptr1->x);
```
```
        else
```
```
            printf("falsen");
```
```
    }
```

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

Answer: d
Explanation: None.

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

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```
    #include <stdio.h>
```
```
    struct p
```
```
    {
```
```
        int x;
```
```
        char y;
```
```
    };
```
```
    int main()
```
```
    {
```

        struct p p1[] = {1, 92, 3, 94, 5, 96};

```
        struct p *ptr1 = p1;
```

        int x = (sizeof(p1) / sizeof(ptr1));

```
        if (x == 1)
```
```
            printf("%d\n", ptr1->x);
```
```
        else
```
```
            printf("false\n");
```
```
    }
```

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

Answer: c
Explanation: None.

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

```
    #include <stdio.h>
```
```
    struct p
```
```
    {
```
```
        int x;
```
```
        char y;
```
```
    };
```
```
    typedef struct p* q*;
```
```
    int main()
```
```
    {
```

        struct p p1[] = {1, 92, 3, 94, 5, 96};

```
        q ptr1 = p1;
```
```
        printf("%d\n", ptr1->x);
```
```
    }
```

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

Answer: a
Explanation: None.

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

```
    #include <stdio.h>
```
```
    struct p
```
```
    {
```
```
        int x;
```
```
        char y;
```
```
    };
```
```
    void foo(struct p* );
```
```
    int main()
```
```
    {
```
```
        typedef struct p* q;
```

        struct p p1[] = {1, 92, 3, 94, 5, 96};

```
        foo(p1);
```
```
    }
```
```
    void foo(struct p* p1)
```
```
    {
```
```
        q ptr1 = p1;
```
```
        printf("%d\n", ptr1->x);
```
```
    }
```

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(){}

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

   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?

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?

```
    #include <stdio.h>
```
```
    struct temp
```
```
    {
```
```
        int a;
```
```
    } s;
```
```
    void change(struct temp);
```
```
    main()
```
```
    {
```
```
        s.a = 10;
```
```
        change(s);
```
```
        printf("%d\n", s.a);
```
```
    }
```
```
    void change(struct temp s)
```
```
    {
```
```
        s.a = 1;
```
```
    }
```

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?

```
 #include <stdio.h>
```
```
    struct p
```
```
     {
```
```
        int x;
```
```
        int y;
```
```
    };
```
```
    int main()
```
```
    {
```

        struct p p1[] = {1, 92, 3, 94, 5, 96};

```
        struct p *ptr1 = p1;
```
```
        int x = (sizeof(p1) / 5);
```
```
        if (x == 3)
```

            printf("%d %d\n", ptr1->x, (ptr1 + x - 1)->x);

```
        else
```
```
            printf("false\n");
```
```
    }
```

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

Answer: d
Explanation: None.

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