C Prog - Pointers
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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.
![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](https://image.slidesharecdn.com/6-pointers-120421040036-phpapp02/85/C-Prog-Pointers-15-320.jpg)
![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](https://image.slidesharecdn.com/6-pointers-120421040036-phpapp02/85/C-Prog-Pointers-17-320.jpg)
![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](https://image.slidesharecdn.com/6-pointers-120421040036-phpapp02/85/C-Prog-Pointers-19-320.jpg)
![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](https://image.slidesharecdn.com/6-pointers-120421040036-phpapp02/85/C-Prog-Pointers-21-320.jpg)
![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](https://image.slidesharecdn.com/6-pointers-120421040036-phpapp02/85/C-Prog-Pointers-23-320.jpg)
![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](https://image.slidesharecdn.com/6-pointers-120421040036-phpapp02/85/C-Prog-Pointers-24-320.jpg)
![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](https://image.slidesharecdn.com/6-pointers-120421040036-phpapp02/85/C-Prog-Pointers-25-320.jpg)
![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](https://image.slidesharecdn.com/6-pointers-120421040036-phpapp02/85/C-Prog-Pointers-27-320.jpg)
C Prog - Pointers
- 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