250+ TOP MCQs on Complicated Declarations and Answers [2024]

C question bank on “Complicated Declarations”. One shall practice these questions to improve their C programming skills needed for various interviews (campus interviews, walkin interviews, company interviews), placements, entrance exams and other competitive exams. These questions can be attempted by anyone focusing on learning C Programming language. They can be a beginner, fresher, engineering graduate or an experienced IT professional. Our C question bank comes with detailed explanation of the answers which helps in better understanding of C concepts.

Here is a listing of C question bank on “Complicated Declarations” along with answers, explanations and/or solutions:

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

```
    #include 
```
```
    void main()
```
```
    {
```
```
        struct student
```
```
        {
```
```
            int no;
```
```
            char name[20];
```
```
        };
```
```
        struct student s;
```
```
        no = 8;
```
```
        printf("%d", no);
```
```
    }
```

a) Nothing
b) Compile time error
c) Junk
d) 8
Answer: b
Clarification: None.

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

```
    #include 
```
```
    struct student
```
```
    {
```
```
        int no;
```
```
        char name[20];
```
```
    };
```
```
    void main()
```
```
    {
```
```
        struct student s;
```
```
        s.no = 8;
```
```
        printf("hello");
```
```
    }
```

a) Run time error
b) Nothing
c) hello
d) Varies
Answer: c
Clarification: None.

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

```
    #include 
```
```
    struct student
```
```
    {
```
```
        int no = 5;
```
```
        char name[20];
```
```
    };
```
```
    void main()
```
```
    {
```
```
        struct student s;
```
```
        s.no = 8;
```
```
        printf("hello");
```
```
    }
```

a) Nothing
b) Compile time error
c) hello
d) Varies
Answer: b
Clarification: None.

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

```
    #include 
```
```
    struct student
```
```
    {
```
```
        int no;
```
```
        char name[20];
```
```
    };
```
```
    void main()
```
```
    {
```
```
        student s;
```
```
        s.name = "hello";
```
```
        printf("hello");
```
```
    }
```

a) Nothing
b) hello
c) Compile time error
d) Varies
Answer: c
Clarification: None.

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

```
    #include 
```
```
    void main()
```
```
    {
```
```
        struct student
```
```
        {
```
```
            int no;
```
```
            char name[20];
```
```
        };
```
```
        struct student s;
```
```
        s.no = 8;
```
```
        printf("%s", s.name);
```
```
    }
```

a) Nothing
b) Compile time error
c) Junk
d) 8
Answer: c
Clarification: None.

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

```
    #include 
```
```
    struct student
```
```
    {
```
```
        int no;
```
```
        char name[20];
```
```
    };
```
```
    struct student s;
```
```
    void main()
```
```
    {
```
```
        s.no = 8;
```
```
        printf("%s", s.name);
```
```
    }
```

a) Nothing
b) Compile time error
c) Junk
d) 8
Answer: a
Clarification: None.

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

```
    #include 
```
```
    int main()
```
```
    {
```
```
        int *((*x)())[2];
```
```
        x();
```
```
        printf("after xn");
```
```
    }
```
```
    int *((*x)())[2]
```
```
    {
```
```
        int **str;
```

        str = (int*)malloc(sizeof(int)* 2);

```
        return str;
```
```
    }
```

a) Compile time error
b) Undefined behaviour
c) After x
d) None of the mentioned
Answer: a
Clarification: None.

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

```
    #include 
```
```
    void (*(f)())(int, float);
```
```
    void (*(*x)())(int, float) = f;
```
```
    void ((*y)(int, float));
```
```
    void foo(int i, float f);
```
```
    int main()
```
```
    {
```
```
        y = x();
```
```
        y(1, 2);
```
```
    }
```
```
    void (*(f)())(int, float)
```
```
    {
```
```
        return foo;
```
```
    }
```
```
    void foo(int i, float f)
```
```
    {
```
```
        printf("%d %fn", i, f);
```
```
    }
```

a) 1 2.000000
b) 1 2
c) Compile time error
d) Segmentation fault/code crash
Answer: a
Clarification: None.

9. What does this declaration say?

a) y is pointer to the function which returns pointer to integer array
b) y is pointer to the function which returns array of pointers
c) y is function which returns function pointer which in turn returns pointer to integer array
d) y is function which returns array of integers
Answer: a
Clarification: None.

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

```
    #include 
```
```
    void (*(f)())(int, float);
```
```
    typedef void (*(*x)())(int, float);
```
```
    void foo(int i, float f);
```
```
    int main()
```
```
    {
```
```
        x = f;
```
```
        x();
```
```
    }
```
```
    void (*(f)())(int, float)
```
```
    {
```
```
        return foo;
```
```
    }
```
```
    void foo(int i, float f)
```
```
    {
```
```
        printf("%d %fn", i, f);
```
```
    }
```

a) Compile time error
b) Undefined behaviour
c) 1 2.000000
d) Nothing
Answer: a
Clarification: None.

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

```
    #include 
```
```
    void (*(f)())(int, float);
```
```
    typedef void (*(*x)())(int, float);
```
```
    void foo(int i, float f);
```
```
    int main()
```
```
    {
```
```
        x p = f;
```
```
        p();
```
```
    }
```
```
    void (*(f)())(int, float)
```
```
    {
```
```
        return foo;
```
```
    }
```
```
    void foo(int i, float f)
```
```
    {
```
```
        printf("%d %fn", i, f);
```
```
    }
```

a) Compile time error
b) Undefined behaviour
c) 1 2.000000
d) Nothing
Answer: d
Clarification: None.

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