250+ TOP MCQs on Scope of a Variable and Answers [2024]

basic C questions on “Scope of a Variable”. One shall practice these basic 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 basic C questions on “Scope of a Variable” along with answers, explanations and/or solutions:

1. What will be the sequence of allocation and deletion of variables in the following C code?

```
    #include 
```
```
    int main()
```
```
    {
```
```
        int a;
```
```
        {
```
```
            int b;
```
```
        }
```
```
    }
```

a) a->b, a->b
b) a->b, b->a
c) b->a, a->b
d) b->a, b->a
Answer: b
Clarification: None.

2. Array sizes are optional during array declaration by using ______ keyword.
a) auto
b) static
c) extern
d) register
Answer: c
Clarification: None.

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

```
    #include 
```
```
    void main()
```
```
    {
```
```
        int x = 3;
```
```
        {
```
```
            x = 4;
```
```
            printf("%d", x);
```
```
        }
```
```
    }
```

a) 4
b) 3
c) 0
d) Undefined
Answer: a
Clarification: None.

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

```
    #include 
```
```
    int x = 5;
```
```
    void main()
```
```
    {
```
```
        int x = 3;
```
```
        m();
```
```
        printf("%d", x);
```
```
    }
```
```
    void m()
```
```
    {
```
```
        x = 8;
```
```
        n();
```
```
    }
```
```
    void n()
```
```
    {
```
```
        printf("%d", x);
```
```
    }
```

a) 8 3
b) 3 8
c) 8 5
d) 5 3
Answer: a
Clarification: None.

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

```
    #include 
```
```
    int x;
```
```
    void main()
```
```
    {
```
```
        m();
```
```
        printf("%d", x);
```
```
    }
```
```
    void m()
```
```
    {
```
```
        x = 4;
```
```
    }
```

a) 0
b) 4
c) Compile time error
d) Undefined
Answer: b
Clarification: None.

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

```
    #include 
```
```
    static int x = 5;
```
```
    void main()
```
```
    {
```
```
        int x = 9;
```
```
        {
```
```
            x = 4;
```
```
        }
```
```
        printf("%d", x);
```
```
    }
```

a) 9
b) 5
c) 4
d) 0
Answer: c
Clarification: None.

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

```
    #include 
```
```
    void main()
```
```
    {
```
```
        {
```
```
            int x = 8;
```
```
        }
```
```
        printf("%d", x);
```
```
    }
```

a) 8
b) 0
c) Undefined
d) Compile time error
Answer: d
Clarification: None.

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