External Variables - C Programming Questions and Answers

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “External Variables – 1”.

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

a) 4
b) Compile time error
c) 0
d) Undefined
View Answer

Answer: b
Explanation: None.

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

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```
    #include <stdio.h>
```
```
    int x;
```
```
    void main()
```
```
    {
```
```
        printf("%d", x);
```
```
    }
```

a) Junk value
b) Run time error
c) 0
d) Undefined
View Answer

Answer: c
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int x = 5;
```
```
    void main()
```
```
    {
```
```
        int x = 3;
```
```
        printf("%d", x);
```
```
        {
```
```
            x = 4;
```
```
        }
```
```
        printf("%d", x);
```
```
    }
```

a) Run time error
b) 3 3
c) 3 5
d) 3 4
View Answer

Answer: d
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int x = 5;
```
```
    void main()
```
```
    {
```
```
        int x = 3;
```
```
        printf("%d", x);
```
```
        {
```
```
            int x = 4;
```
```
        }
```
```
        printf("%d", x);
```
```
    }
```

a) 3 3
b) 3 4
c) 3 5
d) Run time error
View Answer

Answer: a
Explanation: None.

5. Functions in C are always _________
a) Internal
b) External
c) Both Internal and External
d) External and Internal are not valid terms for functions
View Answer

Answer: b
Explanation: None.

6. Global variables are ____________
a) Internal
b) External
c) Both Internal and External
d) None of the mentioned
View Answer

Answer: b
Explanation: None.

7. Which of the following is an external variable in the following C code?

```
    #include <stdio.h>
```
```
    int func (int a)
```
```
    {
```
```
        int b;
```
```
        return b;
```
```
    }
```
```
    int main()
```
```
    {
```
```
        int c;
```
```
        func (c);
```
```
    }
```
```
    int d;
```

a) a
b) b
c) c
d) d
View Answer

Answer: d
Explanation: None.

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

```
     #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        printf("%d", d++);
```
```
    }
```
```
    int d = 10;
```

a) 9
b) 10
c) 11
d) Compile time error
View Answer

Answer: d
Explanation: None.

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

```
    #include <stdio.h>
```
```
    double var = 8;
```
```
    int main()
```
```
    {
```
```
        int var = 5;
```
```
        printf("%d", var);
```
```
    }
```

a) 5
b) 8
c) Compile time error due to wrong format identifier for double
d) Compile time error due to redeclaration of variable with same name
View Answer

Answer: a
Explanation: None.

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