C Array of Structures Questions and Answers

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Arrays of 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>
```
```
    struct point
```
```
    {
```
```
        int x;
```
```
        int y;
```
```
    };
```
```
    void foo(struct point*);
```
```
    int main()
```
```
    {
```

        struct point p1[]  =  {1, 2, 3, 4};

```
        foo(p1);
```
```
    }
```
```
    void foo(struct point p[])
```
```
    {
```
```
        printf("%d\n", p[1].x);
```
```
    }
```

a) Compile time error
b) 3
c) 2
d) 1
View Answer

Answer: b
Explanation: None.

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

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

        struct point p1[] = {1, 2, 3, 4};

```
        foo(p1);
```
```
    }
```
```
    void foo(struct point p[])
```
```
    {
```
```
        printf("%d\n", p->x);
```
```
    }
```

a) 1
b) 2
c) 3
d) Compile time error
View Answer

Answer: a
Explanation: None.

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

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

        struct point p1[] = {1, 2, 3, 4};

```
        foo(p1);
```
```
    }
```
```
    void foo(struct point p[])
```
```
    {
```

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

```
    }
```

a) 1 2
b) 2 2
c) Compile time error
d) Undefined behaviour
View Answer

Answer: b
Explanation: None.

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

```
    #include <stdio.h>
```
```
    struct point
```
```
    {
```
```
        int x;
```
```
        int y;
```
```
    } p[] = {1, 2, 3, 4, 5};
```
```
    void foo(struct point*);
```
```
    int main()
```
```
    {
```
```
        foo(p);
```
```
    }
```
```
    void foo(struct point p[])
```
```
    {
```

        printf("%d %d\n", p->x, p[2].y);

```
    }
```

a) 1 0
b) Compile time error
c) 1 somegarbagevalue
d) Undefined behaviour
View Answer

Answer: a
Explanation: None.

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

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

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

```
        foo(p1);
```
```
    }
```
```
    void foo(struct point p[])
```
```
    {
```

        printf("%d %d\n", p->x, p[3].y);

```
    }
```

a) Compile time error
b) 1 0
c) 1 somegarbagevalue
d) None of the mentioned
View Answer

Answer: c
Explanation: None.

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

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

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

```
        foo(p1);
```
```
    }
```
```
    void foo(struct point p[])
```
```
    {
```

        printf("%d %d\n", p->x, (p + 2).y);

```
    }
```

a) Compile time error
b) 1 0
c) 1 somegarbagevalue
d) Undefined behaviour
View Answer

Answer: a
Explanation: None.

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

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

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

```
        foo(p1);
```
```
    }
```
```
    void foo(struct point p[])
```
```
    {
```

        printf("%d %d\n", p->x, (p + 2)->y);

```
    }
```

a) Compile time error
b) 1 0
c) 1 somegarbagevalue
d) undefined behaviour
View Answer

Answer: b
Explanation: None.

8. What will be the output of the following C code on a 64-bit system?

```
    #include <stdio.h>
```
```
    struct student
```
```
    {
```
```
        char *c;
```
```
    };
```
```
    void main()
```
```
    {
```
```
        struct student s[2];
```
```
        printf("%d", sizeof(s));
```
```
    }
```

a) 2
b) 4
c) 16
d) 8
View Answer

Answer: c
Explanation: On a 64-bit system, size of pointer is 8 bytes. Here, we are printing the size of an array of 2 structures, hence, the size will be 2×8 = 16 bytes.

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