This document provides examples of using pointers in C programming. It contains 11 programs that demonstrate different pointer concepts like passing pointers to functions, pointer arithmetic, arrays of pointers, and 2D arrays. The programs show how to declare and access variables using pointers, pass addresses of variables to functions using pointers, and traverse arrays using pointers. Pointers allow accessing and modifying values referenced by other variables in memory.

1. C Programming - Pointers
Organized By: Vinay Arora
Assistant Professor, CSED
Thapar University, Patiala

2. Program - 1
#include<stdio.h> void swapr(int x, int y)
#include<conio.h> {
void swapr(int,int); int t;
int main() t=x;
{ x=y;
int a=10,b=20; y=t;
clrscr(); }
printf("Value of variable a=%d and b=%d",a,b);
swapr(a,b);
printf("nValue of variable a=%d and b=%d",a,b);
getch();
}
Vinay Arora
CSED

3. Program – 1 (output)
Vinay Arora
CSED

4. Program - 2
#include<stdio.h> void swapr(int *x, int *y)
#include<conio.h> {
void swapr(int *, int *); int t;
int main() t=*x;
{ *x=*y;
int a=10,b=20; *y=t;
clrscr(); }
printf("Value of variable a=%d and b=%d",a,b);
swapr(&a,&b);
printf("nValue of variable a=%d and b=%d",a,b);
getch();
}
Vinay Arora
CSED

5. Program – 2 (output)
Vinay Arora
CSED

6. Program - 3
#include<stdio.h> void areaperi(int r, float *a, float *p)
#include<conio.h> {
void areaperi(int,float *,float *); *a=3.14*r*r;
int main()
*p=2*3.14*r;
{
int radius; }
float area, perimeter;
clrscr();
printf("Enter radius of circle");
scanf("%d",&radius);
areaperi(radius,&area,&perimeter);
printf("Area=%fn",area);
printf("Perimeter=%fn",perimeter);
return 0;
}
Vinay Arora
CSED

7. Program – 3 (output)
Vinay Arora
CSED

8. Passing Array Value (CBVal)
Vinay Arora
CSED

9. Passing Array Reference (CBRef)
Vinay Arora
CSED

10. Vinay Arora
CSED

11. Program - 4
#include<stdio.h>
#include<conio.h>
void main()
{
int i, *x;
clrscr();
printf("Enter any Integer Valuet");
scanf("%d",&i);
x=&i;
printf("nx=Address value of in");
printf("nValue of x = %u",x);
x++;
printf("nAfter Increment in Pointern");
printf("Value of x = %u",x);
getch();
}
Vinay Arora
CSED

12. Program – 4 (output)
Vinay Arora
CSED

13. Program - 5
#include<stdio.h>
#include<conio.h>
void main()
{
int a=10, b=20, *p, *j;
clrscr();
p=&a;
j=&b;
printf("nAddition *p + b = %d", *p + b);
printf("nAddition *p + *j = %d", *p + *j);
printf("nAddition *(p) + *(j) = %d", *(p) + *(j));
printf("nAddition *(&a) + *(&b) = %d", *(&a) + *(&b));
getch();
}
Vinay Arora
CSED

14. Program – 5 (output)
Vinay Arora
CSED

15. Program - 6
#include<stdio.h>
#include<conio.h> printf("nj - i = %d",j-i);
printf("n*j - *i =%d",*j - *i);
void main()
{ getch();
int arr[]={10,20,30,45,67,56,74}; }
int *i,*j;
int x;
clrscr();
printf("Array Elements are");
for(x=0;x<=6;x++)
{
printf("n Value at arr[%d] is %d",x,arr[x]);
}
i=&arr[1];
j=&arr[5];
Vinay Arora
CSED

16. Program – 6 (output)
Vinay Arora
CSED

17. Program - 7
#include<stdio.h> for(i=0;i<=5;i++)
#include<conio.h> {
printf("nAddress = %u",j);
void main() printf("nElement = %d",*j);
{ j++;
int num[]={24,34,12,44,56,17}; }
int i,*j;
getch();
clrscr(); }
printf("Array Elements are");
for(i=0;i<=5;i++)
{
printf("n Value at arr[%d] is %d",i,num[i]);
}
j=&num[0];
Vinay Arora
CSED

18. Program – 7 (output)
Vinay Arora
CSED

19. Program – 8 (Diff. notations for accessing Array)
#include<stdio.h> getch();
#include<conio.h> }
void main()
{
int num[]={24,34,12};
int i;
clrscr();
printf("Array Elements are");
for(i=0;i<=2;i++)
{
printf("n Value at arr[%d] is %d",i,num[i]);
printf("n Value at arr[%d] is %d",i,i[num]);
printf("n Value at arr[%d] is %d",i,*(num+i));
printf("n Value at arr[%d] is %d",i,*(i+num));
printf("n");
}
Vinay Arora
CSED

20. Program – 8 (output)
Vinay Arora
CSED

21. Program - 9
#include<stdio.h>
#include<conio.h>
void main()
{
int s[3][2]={
{10,15},
{20,25},
{30,35}
};
int i;
clrscr();
for(i=0;i<=2;i++)
printf("Address of %dth 1-D array = %un",i,s[i]);
getch();
}
Vinay Arora
CSED

22. Program – 9 (output)
Vinay Arora
CSED

23. Program – 10 (Conti…)
#include<stdio.h> printf("Notation Used is s[i][j])n");
#include<conio.h> for(i=0;i<=2;i++)
void main() {
{ for(j=0;j<=1;j++)
int s[3][2]={ {
{10,15}, printf("t%d",s[i][j]);
{20,25}, }
{30,35} printf("n");
}; }
int i,j;
clrscr(); getch();
printf("Array Elements aren"); }
Vinay Arora
CSED

24. Program – 10 (Conti…)
#include<stdio.h> printf("nAccessing 2-D Arrayn");
#include<conio.h> printf("Notation Used is *(s[i]+j)n");
void main() for(i=0;i<=2;i++)
{ {
int s[3][2]={ for(j=0;j<=1;j++)
{10,15}, {
{20,25}, printf("t%d",*(s[i]+j));
{30,35} }
}; printf("n");
int i,j; }
clrscr();
getch();
}
Vinay Arora
CSED

25. Program – 10 (Conti…)
#include<stdio.h> printf("nAccessing 2-D Arrayn");
#include<conio.h> printf("Notation Used is
void main() *(*(s+i)+j)n");
{ for(i=0;i<=2;i++)
int s[3][2]={ {
{10,15}, for(j=0;j<=1;j++)
{20,25}, {
{30,35} printf("t%d",*(*(s+i)+j));
}; }
int i,j; printf("n");
clrscr(); }
getch();
}
Vinay Arora
CSED

26. Program – 10 (output)
Vinay Arora
CSED

27. Program – 11 (Array of Pointer)
#include<stdio.h> printf("Address of variable a,b,cn");
#include<conio.h> printf("%un",a);
printf("%un",b);
void main() printf("%un",c);
{
int *arr[3]; printf("Value Present in Arrayn");
int i=10, j=20, k=30, m; for(m=0;m<=2;m++)
int *a,*b,*c; {
printf("n%u",arr[m]);
clrscr(); }
printf("n"); printf("n");
arr[0] = &i; for(m=0;m<=2;m++)
arr[1] = &j; for(m=0;m<=2;m++)
{ {
arr[2] = &k; printf("n%d",*(arr[m]));
printf("n%u",&arr[m]);
} }
a=&i; getch();
b=&j; }
c=&k;
Vinay Arora
CSED

28. Program – 11 (output)
Vinay Arora
CSED

29. Thnx…
Vinay Arora
CSED