C Pointer to Pointer Questions and Answers

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Pointers to Pointers – 2”.

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

1. What substitution should be made to //-Ref such that ptr1 points to variable c in the following C code?

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int a = 1, b = 2, c = 3;
```
```
        int *ptr1 = &a;
```
```
        int **sptr = &ptr1;
```
```
        //-Ref
```
```
    }
```

a) *sptr = &c;
b) **sptr = &c;
c) *ptr1 = &c;
d) none of the mentioned
View Answer

Answer: a
Explanation: None.

2. Which of the following declaration will result in run-time error?
a) int **c = &c;
b) int **c = &*c;
c) int **c = **c;
d) none of the mentioned
View Answer

Answer: d
Explanation: None.

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3. Comment on the output of the following C code.

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int a = 10;
```
```
        int **c -= &&a;
```
```
    }
```

a) You cannot apply any arithmetic operand to a pointer
b) We don’t have address of an address operator
c) We have address of an address operator
d) None of the mentioned
View Answer

Answer: b
Explanation: None.

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

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

a) 5 5 5
b) 5 5 junk value
c) 5 junk junk
d) Compile time error
View Answer

Answer: a
Explanation: None.

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

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

a) 5 5 5
b) 5 5 junk value
c) 5 junk junk
d) Compile time error
View Answer

Answer: d
Explanation: None.

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

```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        int k = 5;
```
```
        int *p = &k;
```
```
        int **m  = &p;
```
```
        **m = 6;
```
```
        printf("%d\n", k);
```
```
    }
```

a) 5
b) Run time error
c) 6
d) Junk
View Answer

Answer: c
Explanation: None.

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

```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        int a[3] = {1, 2, 3};
```
```
        int *p = a;
```
```
        int *r = &p;
```
```
        printf("%d", (**r));
```
```
    }
```

a) 1
b) Compile time error
c) Address of a
d) Junk value
View Answer

Answer: b
Explanation: None.

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