C MCQ set number 00720

1. What is the output of this C code?

```
    #include <stdio.h>
```
```
    struct student
```
```
    {
```
```
        char *c;
```
```
    };
```
```
    void main()
```
```
    {
```
```
        struct student m;
```
```
        struct student *s = &m;
```
```
        s->c = "hello";
```
```
        printf("%s", s->c);
```
```
    }
```

a) hello
b) Run time error
c) Nothing
d) Depends on compiler

Answer

Answer: a [Reason:] None.

2. What is the output of this C code?

```
    #include <stdio.h>
```
```
    struct student
```
```
    {
```
```
        char *c;
```
```
    };
```
```
    void main()
```
```
    {
```
```
        struct student *s;
```
```
        s->c = "hello";
```
```
        printf("%s", s->c);
```
```
    }
```

a) hello
b) Segmentation fault
c) Run time error
d) Nothing

Answer

Answer: b [Reason:] None.

3. What is the output of this C code?

```
    #include <stdio.h>
```
```
    struct student
```
```
    {
```
```
        char *c;
```
```
    };
```
```
    void main()
```
```
    {
```
```
        struct student m;
```
```
        struct student *s = &m;
```
```
        s->c = "hello";
```
```
        printf("%s", m.c);
```
```
    }
```

a) Run time error
b) Nothing
c) hello
d) Varies

Answer

Answer: c [Reason:] None.

4. What is the output of this C code?

```
    #include <stdio.h>
```
```
    struct student
```
```
    {
```
```
        char *c;
```
```
    };
```
```
    void main()
```
```
    {
```
```
        struct student m;
```
```
        struct student *s = &m;
```
```
        (*s).c = "hello";
```
```
        printf("%s", m.c);
```
```
    }
```

a) Run time error
b) Nothing
c) Varies
d) hello

Answer

Answer: d [Reason:] None.

5. What is the output of this C code?

```
    #include <stdio.h>
```
```
    struct student
```
```
    {
```
```
        char *c;
```
```
    };
```
```
    void main()
```
```
    {
```
```
        struct student n;
```
```
        struct student *s = &n;
```
```
        (*s).c = "hello";
```
```
        printf("%pn%pn", s, &n);
```
```
    }
```

a) Different address
b) Run time error
c) Nothing
d) Same address

Answer

Answer: d [Reason:] None.

6. What is the output of this C code?

```
    #include <stdio.h>
```
```
    struct p
```
```
    {
```
```
        int x[2];
```
```
    };
```
```
    struct q
```
```
    {
```
```
        int *x;
```
```
    };
```
```
    int main()
```
```
    {
```
```
        struct p p1 = {1, 2};
```
```
        struct q *ptr1;
```
```
        ptr1->x = (struct q*)&p1.x;
```
```
        printf("%dn", ptr1->x[1]);
```
```
    }
```

a) Compile time error
b) Segmentation fault/code crash
c) 2
d) 1

Answer

Answer: b [Reason:] None.

7. What is the output of this C code?

```
    #include <stdio.h>
```
```
    struct p
```
```
    {
```
```
        int x[2];
```
```
    };
```
```
    struct q
```
```
    {
```
```
        int *x;
```
```
    };
```
```
    int main()
```
```
    {
```
```
        struct p p1 = {1, 2};
```

        struct q *ptr1 = (struct q*)&p1;

```
        ptr1->x = (struct q*)&p1.x;
```
```
        printf("%dn", ptr1->x[0]);
```
```
    }
```

a) Compile time error
b) Undefined behaviour
c) Segmentation fault/code crash
d) 1

Answer

Answer: b [Reason:] None.

8. What is the output of this C code?

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

        struct p p1[] = {1, 2, 3, 4, 5, 6};

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

        printf("%d %dn", ptr1->x, (ptr1 + 2)->x);

```
    }
```

a) 1 5
b) 1 3
c) Compile time error
d) 1 4

Answer

Answer: a [Reason:] None.

9. What is the output of this 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) / sizeof(struct p));

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

```
    }
```

a) Compile time error
b) Undefined behaviour
c) 1 3
d) 1 5

Answer

Answer: d [Reason:] None.

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