Pointers & Addresses - C Programming Questions and Answers

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Pointers and Addresses”.

Pre-requisite for C Pointers and Addresses MCQ set: Video Tutorial on C Pointers.

1. Which is an indirection operator among the following?
a) &
b) *
c) ->
d) .
View Answer

Answer: b
Explanation: None.

2. Which of the following does not initialize ptr to null (assuming variable declaration of a as int a=0;)?
a) int *ptr = &a;
b) int *ptr = &a – &a;
c) int *ptr = a – a;
d) All of the mentioned
View Answer

Answer: a
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int x = 0;
```
```
    void main()
```
```
    {
```
```
        int *ptr = &x;
```
```
        printf("%p\n", ptr);
```
```
        x++;
```
```
        printf("%p\n ", ptr);
```
```
    }
```

a) Same address
b) Different address
c) Compile time error
d) Varies
View Answer

Answer: a
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int x = 0;
```
```
    void main()
```
```
    {
```
```
        int *const ptr = &x;
```
```
        printf("%p\n", ptr);
```
```
        ptr++;
```
```
        printf("%p\n ", ptr);
```
```
    }
```

a) 0 1
b) Compile time error
c) 0xbfd605e8 0xbfd605ec
d) 0xbfd605e8 0xbfd605e8
View Answer

Answer: b
Explanation: None.

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

```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        int x = 0;
```
```
        int *ptr = &x;
```
```
        printf("%p\n", ptr);
```
```
        ptr++;
```
```
        printf("%p\n ", ptr);
```
```
    }
```

a) 0xbfd605e8 0xbfd605ec
b) 0xbfd605e8 0cbfd60520
c) 0xbfd605e8 0xbfd605e9
d) Run time error
View Answer

Answer: a
Explanation: None.

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

```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        int x = 0;
```
```
        int *ptr = &5;
```
```
        printf("%p\n", ptr);
```
```
    }
```

a) 5
b) Address of 5
c) Nothing
d) Compile time error
View Answer

Answer: d
Explanation: None.

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

```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        int x = 0;
```
```
        int *ptr = &x;
```
```
        printf("%d\n", *ptr);
```
```
    }
```

a) Address of x
b) Junk value
c) 0
d) Run time error
View Answer

Answer: c
Explanation: None.

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