Automatic Variables - C Programming Questions and Answers

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

Pre-requisite for this C MCQ set: Advanced C Programming Video Tutorial.

1. What is the scope of an automatic variable?
a) Within the block it appears
b) Within the blocks of the block it appears
c) Until the end of program
d) Within the block it appears & Within the blocks of the block it appears
View Answer

Answer: d
Explanation: None.

2. Automatic variables are allocated space in the form of a __________
a) stack
b) queue
c) priority queue
d) random
View Answer

Answer: a
Explanation: None.

3. Which of the following is a storage specifier?
a) enum
b) union
c) auto
d) volatile
View Answer

Answer: c
Explanation: None.

4. If storage class is not specified for a local variable, then the default class will be auto.
a) True
b) False
c) Depends on the standard
d) None of the mentioned
View Answer

Answer: a
Explanation: None.

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

```
    #include <stdio.h>
```
```
    void foo(auto int i);
```
```
    int main()
```
```
    {
```
```
        foo(10);
```
```
    }
```
```
    void foo(auto int i)
```
```
    {
```
```
        printf("%d\n", i );
```
```
    }
```

a) 10
b) Compile time error
c) Depends on the standard
d) None of the mentioned
View Answer

Answer: b
Explanation: None.

6. Automatic variables are stored in ________
a) stack
b) data segment
c) register
d) heap
View Answer

Answer: a
Explanation: None.

7. What linkage does automatic variables have?
a) Internal linkage
b) External linkage
c) No linkage
d) None of the mentioned
View Answer

Answer: c
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        auto i = 10;
```
```
        const auto int *p = &i;
```
```
        printf("%d\n", i);
```
```
    }
```

a) 10
b) Compile time error
c) Depends on the standard
d) Depends on the compiler
View Answer

Answer: a
Explanation: None.

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