Self-Referential Structures - C Programming Questions and Answers

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Self-Referential Structures – 2”.

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>
```
```
    typedef struct p *q;
```
```
    int main()
```
```
    {
```
```
        struct p
```
```
        {
```
```
            int x;
```
```
            char y;
```
```
            q ptr;
```
```
        };
```
```
        struct p p = {1, 2, &p};
```
```
        printf("%d\n", p.ptr->x);
```
```
        return 0;
```
```
    }
```

a) Compile time error
b) 1
c) Depends on the compiler
d) None of the mentioned
View Answer

Answer: a
Explanation: None.

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

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```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        typedef struct p *q;
```
```
        struct p
```
```
        {
```
```
            int x;
```
```
            char y;
```
```
            q ptr;
```
```
        };
```
```
        struct p p = {1, 2, &p};
```
```
        printf("%d\n", p.ptr->x);
```
```
        return 0;
```
```
    }
```

a) Compile time error
b) 1
c) Depends on the compiler
d) Depends on the standard
View Answer

Answer: b
Explanation: None.

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

```
    #include <stdio.h>
```
```
    typedef struct p *q;
```
```
    struct p
```
```
    {
```
```
        int x;
```
```
        char y;
```
```
        q ptr;
```
```
    };
```
```
    int main()
```
```
    {
```
```
        struct p p = {1, 2, &p};
```
```
        printf("%d\n", p.ptr->ptr->x);
```
```
        return 0;
```
```
    }
```

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

Answer: d
Explanation: None.

4. The number of distinct nodes the following struct declaration can point to is _____________

```
    struct node
```
```
    {
```
```
        struct node *left;
```
```
        struct node *centre;
```
```
        struct node *right;
```
```
    };
```

a) 1
b) 2
c) 3
d) All of the mentioned
View Answer

Answer: d
Explanation: None.

5. Which of the following is not possible regarding the structure variable?
a) A structure variable pointing to itself
b) A structure variable pointing to another structure variable of same type
c) 2 different type of structure variable pointing at each other
d) None of the mentioned
View Answer

Answer: d
Explanation: None.

6. Which of the following technique is faster for travelling in binary trees?
a) Iteration
b) Recursion
c) Both Iteration and Recursion
d) Depends from compiler to compiler
View Answer

Answer: b
Explanation: None.

7. Which of the following will stop the loop at the last node of a linked list in the following C code snippet?

```
    struct node
```
```
    {
```
```
        struct node *next;
```
```
    };
```

    while (p != NULL)
    {
        p = p->next;
    }

    while (p->next != NULL)
    {
        p = p->next;
    }

    while (1)
    {
        p = p->next;
        if (p == NULL)
            break;
    }

d) All of the mentioned
View Answer

Answer: b
Explanation: None.

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