C Programming Questions and Answers – Pointers and Arrays

C Programming Questions and Answers – Pointers and Arrays

1.What is the output of this 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

2.What is the output of this C code?

#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

3.What is the output of this 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

4.What is the output of this 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

5.What is the output of this 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

6.What is the output of the code given below?

#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

7.What is the output of the code given below?

#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

8.What is the output of the code given below?

#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

9.What is the output of this C code?

#include <stdio.h>

int main()

{

int ary[4] = {1, 2, 3, 4};

printf(“%d\n”, *ary);

}

a) 1

b) Compile time error

c) Some garbage value

d) Undefined variable

10.What is the output of this C code?

#include <stdio.h>

int main()

{

const int ary[4] = {1, 2, 3, 4};

int *p;

p = ary + 3;

*p = 5;

printf(“%d\n”, ary[3]);

}

a) 4

b) 5

c) Compile time error

d) 3

11.Different ways to initialize an array with all elements as zero are

a) int array[5] = {};

b) int array[5] = {0};

c) int a = 0, b = 0, c = 0;

int array[5] = {a, b, c};

d) All of the mentioned

12.The elements in the array of the following code are

int array[5] = {5};

a) 5, 5, 5, 5, 5

b) 5, 0, 0, 0, 0

c) 5, (garbage), (garbage), (garbage), (garbage)

d) (garbage), (garbage), (garbage), (garbage), 5

13.Which of the following declaration is illegal?

a) int a = 0, b = 1, c = 2;

int array[3] = {a, b, c};

b) int size = 3;

int array[size];

c) int size = 3;

int array[size] = {1, 2, 3};

d) All of the mentioned

14.An array of similar data types which themselves are collection of dissimilar data type are

a) Linked Lists

b) Trees

c) Array of Structure

d) All of the mentioned

15.Comment on an array of void data type:

a) It can store any data-type

b) It only stores element of similar data type to first element

c) It acquires the data type with the highest precision in it

d) You cannot have an array of void data type

16.What is the output of the code given below?

#include <stdio.h>

int main()

{

int ary[4] = {1, 2, 3, 4};

int p[4];

p = ary;

printf(“%d\n”, p[1]);

}

a) 1

b) Compile time error

c) Undefined behaviour

d) 2