C Pointers Questions and Answers

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Pointers and Arrays – 1”.

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

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

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

a) Same address is printed
b) Different address is printed
c) Compile time error
d) Nothing
View Answer

Answer: a
Explanation: None.

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

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```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        char *s = "hello";
```
```
        char *p = s;
```
```
        printf("%p\t%p", p, s);
```
```
    }
```

a) Different address is printed
b) Same address is printed
c) Run time error
d) Nothing
View Answer

Answer: b
Explanation: None.

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

```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        char *s= "hello";
```
```
        char *p = s;
```
```
        printf("%c\t%c", p[0], s[1]);
```
```
    }
```

a) Run time error
b) h h
c) h e
d) h l
View Answer

Answer: c
Explanation: None.

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

```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        char *s= "hello";
```
```
        char *p = s;
```

        printf("%c\t%c", *(p + 3),  s[1]);

```
    }
```

a) h e
b) l l
c) l o
d) l e
View Answer

Answer: d
Explanation: None.

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

```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        char *s= "hello";
```
```
        char *p = s;
```
```
        printf("%c\t%c", 1[p], s[1]);
```
```
    }
```

a) h h
b) Run time error
c) l l
d) e e
View Answer

Answer: d
Explanation: None.

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

```
    #include <stdio.h>
```
```
    void foo( int[] );
```
```
    int main()
```
```
    {
```
```
        int ary[4] = {1, 2, 3, 4};
```
```
        foo(ary);
```
```
        printf("%d ", ary[0]);
```
```
    }
```
```
    void foo(int p[4])
```
```
    {
```
```
        int i = 10;
```
```
        p = &i;
```
```
        printf("%d ", p[0]);
```
```
    }
```

a) 10 10
b) Compile time error
c) 10 1
d) Undefined behaviour
View Answer

Answer: c
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int ary[4] = {1, 2, 3, 4};
```
```
        int *p = ary + 3;
```
```
        printf("%d\n", p[-2]);
```
```
    }
```

a) 1
b) 2
c) Compile time error
d) Some garbage value
View Answer

Answer: b
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int ary[4] = {1, 2, 3, 4};
```
```
        int *p = ary + 3;
```

        printf("%d %d\n", p[-2], ary[*p]);

```
    }
```

a) 2 3
b) Compile time error
c) 2 4
d) 2 somegarbagevalue
View Answer

Answer: d
Explanation: None.

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