250+ TOP MCQs on Basics of Functions and Answers

C Objective Questions on “Basics of Functions”. One shall practice these Objective 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 Objective Questions come with detailed explanation of the answers which helps in better understanding of C concepts.

Here is a listing of C Objective Questions on “Basics of Functions” along with answers, explanations and/or solutions:

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

```
    #include 
```
```
    int main()
```
```
    {
```
```
        void foo();
```
```
        printf("1 ");
```
```
        foo();
```
```
    }
```
```
    void foo()
```
```
    {
```
```
        printf("2 ");
```
```
    }
```

a) 1 2
b) Compile time error
c) 1 2 1 2
d) Depends on the compiler
Answer: a
Clarification: None.

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

```
    #include 
```
```
    int main()
```
```
    {
```
```
        void foo(), f();
```
```
        f();
```
```
    }
```
```
    void foo()
```
```
    {
```
```
        printf("2 ");
```
```
    }
```
```
    void f()
```
```
    {
```
```
        printf("1 ");
```
```
        foo();
```
```
    }
```

a) Compile time error as foo is local to main
b) 1 2
c) 2 1
d) Compile time error due to declaration of functions inside main
Answer: b
Clarification: None.

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

```
    #include 
```
```
    int main()
```
```
    {
```
```
        void foo();
```
```
        void f()
```
```
        {
```
```
            foo();
```
```
        }
```
```
        f();
```
```
    }
```
```
    void foo()
```
```
    {
```
```
        printf("2 ");
```
```
    }
```

a) 2 2
b) 2
c) Compile time error
d) Depends on the compiler
Answer: d
Clarification: Even though the answer is 2, this code will compile fine only with gcc. GNU C supports nesting of functions in C as a language extension whereas standard C compiler doesn’t.

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

```
    #include 
```
```
    void foo();
```
```
    int main()
```
```
    {
```
```
        void foo();
```
```
        foo();
```
```
        return 0;
```
```
    }
```
```
    void foo()
```
```
    {
```
```
        printf("2 ");
```
```
    }
```

a) Compile time error
b) 2
c) Depends on the compiler
d) Depends on the standard
Answer: b
Clarification: None.

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

```
    #include 
```
```
    void foo();
```
```
    int main()
```
```
    {
```
```
        void foo(int);
```
```
        foo(1);
```
```
        return 0;
```
```
    }
```
```
    void foo(int i)
```
```
    {
```
```
        printf("2 ");
```
```
    }
```

a) 2
b) Compile time error
c) Depends on the compiler
d) Depends on the standard
Answer: a
Clarification: None.

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

```
    #include 
```
```
    void foo();
```
```
    int main()
```
```
    {
```
```
        void foo(int);
```
```
        foo();
```
```
        return 0;
```
```
    }
```
```
    void foo()
```
```
    {
```
```
        printf("2 ");
```
```
    }
```

a) 2
b) Compile time error
c) Depends on the compiler
d) Depends on the standard
Answer: b
Clarification: None.

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

```
    #include 
```
```
    void m()
```
```
    {
```
```
        printf("hi");
```
```
    }
```
```
    void main()
```
```
    {
```
```
        m();
```
```
    }
```

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

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

```
    #include 
```
```
    void m();
```
```
    void n()
```
```
    {
```
```
        m();
```
```
    }
```
```
    void main()
```
```
    {
```
```
        void m()
```
```
        {
```
```
            printf("hi");
```
```
        }
```
```
    }
```

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

250+ TOP MCQs on Pointers and Arrays and Answers

250+ TOP MCQs on Basics of Functions and Answers

Leave a Comment Cancel Reply

Interview Questions List

Related Posts

Leave a Comment Cancel Reply