External Variables Interview Questions and Answers

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “External Variables – 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>
```
```
    double i;
```
```
    int main()
```
```
    {
```
```
       printf("%g\n",i);
```
```
       return 0;
```
```
    }
```

a) 0
b) 0.000000
c) Garbage value
d) Depends on the compiler
View Answer

Answer: a
Explanation: None.

2. Which part of the program address space is p stored in the following C code?

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```
    #include <stdio.h>
```
```
    int *p = NULL;
```
```
    int main()
```
```
    {
```
```
        int i = 0;
```
```
        p = &i;
```
```
        return 0;
```
```
    }
```

a) Code/text segment
b) Data segment
c) Bss segment
d) Stack
View Answer

Answer: b
Explanation: None.

3. Which part of the program address space is p stored in the following C code?

```
    #include <stdio.h>
```
```
    int *p;
```
```
    int main()
```
```
    {
```
```
        int i = 0;
```
```
        p = &i;
```
```
        return 0;
```
```
    }
```

a) Code/text segment
b) Data segment
c) Bss segment
d) Stack
View Answer

Answer: c
Explanation: None.

4. Can variable i be accessed by functions in another source file?

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

a) Yes
b) No
c) Only if static keyword is used
d) Depends on the type of the variable
View Answer

Answer: a
Explanation: None.

5. Property of the external variable to be accessed by any source file is called by the C90 standard as __________
a) external linkage
b) external scope
c) global scope
d) global linkage
View Answer

Answer: a
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int *i;
```
```
    int main()
```
```
    {
```
```
        if (i == NULL)
```
```
            printf("true\n");
```
```
        return 0;
```
```
    }
```

a) true
b) true only if NULL value is 0
c) Compile time error
d) Nothing
View Answer

Answer: a
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int *i;
```
```
    int main()
```
```
    {
```
```
        if (i == 0)
```
```
            printf("true\n");
```
```
        return 0;
```
```
    }
```

a) true
b) true only if NULL value is 0
c) Compile time error
d) Nothing
View Answer

Answer: b
Explanation: None.

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

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

a) 9
b) 4
c) 5
d) 0
View Answer

Answer: a
Explanation: None.

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C Programming Questions and Answers – External Variables – 2

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