C program to illustrate the use of pointers in arithmetic operations

Program

#include<stdio.h>

main()

{

int a[10]={9,8,7,6,5,4,3,2,1};

int *pa=a;

char b[10]={'a','b','c','j','e','f','g','h','i','\0'};

char *pb=b;

float c[10]={9,8,7,6,5,4,3,2,1};

float *pc=c;

clrscr();

printf("\nInteger pointer arithmatic\n");

printf("*pa:%d\t",*pa);

printf("pa:%u\t",pa);

printf("pa++:%u\t",++pa);

printf("*pa:%d\t",*pa);

printf("pa:%u\t",pa);

printf("pa+5:%u\t",pa=pa+5);

printf("*pa:%d\t",*pa);

printf("pa:%u\t",pa);

printf("pa-a:%u\t",pa-a);

printf("pa:%u\t",pa);

printf("pa--:%u\t",--pa);

printf("*pa:%d\t",*pa);

printf("pa:%u\t",pa);

printf("pa-5:%u\t",pa=pa-5);

printf("*pa:%d\t",*pa);

printf("pa:%u\t",pa);

printf("\n\n");

printf("\nCharacter pointer arithmatic\n");

printf("*pb:%c\t",*pb);

printf("pb:%u\t",pb);

printf("pb++:%u\t",++pb);

printf("*pb:%c\t",*pb);

printf("pb:%u\t",pb);

printf("pb+5:%u\t",pb=pb+5);

printf("*pb:%c\t",*pb);

printf("pb:%u\t",pb);

printf("pb-b:%u\t",pb-b);

printf("pb:%u\t",pb);

printf("pb--:%u\t",--pb);

printf("*pb:%c\t",*pb);

printf("pb:%u\t",pb);

printf("pb-5:%u\t",pb=pb-5);

printf("*pb:%c\t",*pb);

printf("pb:%u\t",pb);

printf("\n\n");

printf("\nFloat pointer arithmatic\n");

printf("*pc:%f\t",*pc);

printf("pc:%u\t",pc);

printf("pc++:%u\t",++pc);

printf("*pc:%f\t",*pc);

printf("pc:%u\t",pc);

printf("pc+5:%u\t",pc=pc+5);

printf("*pb:%f\t",*pc);

printf("pc:%u\t",pc);

printf("pc-b:%u\t",pc-c);

printf("pc:%u\t",pc);

printf("pc--:%u\t",--pc);

printf("*pc:%f\t",*pc);

printf("pc:%u\t",pc);

printf("pc-5:%u\t",pc=pc-5);

printf("*pc:%f\t",*pc);

printf("pc:%u\t",pc);

getch();

}

Output:

 Integer pointer arithmatic
*pa:9   pa:65426        pa++:65428      *pa:8   pa:65428        pa+5:65438
*pa:3   pa:65438        pa-a:6  pa:65438        pa--:65436      *pa:4   pa:65436
        pa-5:65426      *pa:9   pa:65426


Character pointer arithmatic
*pb:a   pb:65446        pb++:65447      *pb:b   pb:65447        pb+5:65452
*pb:g   pb:65452        pb-b:6  pb:65452        pb--:65451      *pb:f   pb:65451
        pb-5:65446      *pb:a   pb:65446


Float pointer arithmatic
*pc:9.000000    pc:65456        pc++:65460      *pc:8.000000    pc:65460
pc+5:65480      *pb:3.000000    pc:65480        pc-b:6  pc:65480        pc--:654
76      *pc:4.000000    pc:65476        pc-5:65456      *pc:9.000000    pc:65456