Pointers
Data Structures 15CS33
1.
Given
the following declarations:
int x ;
double d;
int *p;
double *q;
Which of the following expressions
are not allowed?
i)
p
= &x;
ii)
p
= &d;
iii)
q
= &x;
iv)
q
= &d
v)
p
= x;
(December
2007)
(5
marks)
2.
Show
what would be printed from the following block:
#include<stdio.h>
void fun (int (*p)[3])
{
printf ("\n%d %d
%d", (*p)[0], (*p)[1], *p[2]);
return;
}
void main()
{
/* local definitions */
int x [2][3] = { { 4,5, 2}, { 7,6, 9} };
/* statements */
fun (x);
fun (x+1);
return 0;
}
(December
2007)
(6
marks)
Output:
4 5
2686792
7
6 2130567168
3.
What
is pointer variable? Can we have multiple pointer to variable?
(June 2009)
(December 2009)
(June 2010)
(6 marks)
4.
Show
the output of the following block:
main()
{
int
num[5] = {3,4,6,2,1};
int
*p = num;
int
*q = num+2;
int
*r = &num[1];
printf("\n%d
%d", num[2], *(num+2));
printf("\n%d
%d", *p, *(p+1));
printf("\n%d %d",
*q, *(q+1));
printf("\n%d %d",
*r, *(r+1));
}
(June
2009)
(December
2010)
(6
marks)
Output:
6 6
3 4
6 2
4 6
5.
What
is pointer to pointer?Write a C program to find the smallest element in an
array (using pointer and function)
(December 2009)
(7 marks)
6.
Write
the output of the following
#include<stdio.h>
main()
{
int a = 5;
int b = 7;
int *p = &a;
int *q = &b;
printf("\n%d",
++a);
printf("\n%d",
++(*p));
printf("\n%d",
--(*q));
printf("\n%d",
--b);
}
(December 2009)
(4 marks)
Output:
6
7
6
5
7.
Write
a C program to read 10 integers and store them in an array using pointers.
Print their sum and average.
(June 2010)
(5 marks)
8.
What
is pointer? What are the uses of pointers?
How do you declare and initialize the pointers? How do you access the
value pointed by the pointers?
(June 2010)
(December 2010)
(June 2012)
(December 2012)
(June 2013)
(June 2014)
(December 2014)
(5 marks)
9.
Write
a C function to swap two numbers using a pointers.
(June
2012)(5 marks)
