Basics about pointers

# include <stdio.h>
# include <conio.h>
main(){
int no=100;   /* decl of int variable */
int*ptr;      /* decl of int* */
ptr=&no;      /* init int var address to poi */

clrscr();
printf("\n%d",*ptr);
printf("\n%x    %x     %x",&ptr,ptr,&no);

*ptr=200;
printf("\n%d",*ptr);

/* char poi   */

char ch='A';
char*cptr;
cptr=&ch;
printf("\n%c",*cptr);
/* array vs poi   */

int n[]={10,20,30,40,50};
ptr=&n[2];    /*   or ptr=n;       initializing 2nd index to poi*/

*(ptr+2)=100;

printf("\n%d        %d",*(ptr+2),n[2]);

/* address decrementing and incrementing  by 2b */
*ptr--;

printf("\n%d",*ptr);
*ptr++;
printf("\n%d",*ptr);

/*  void pointers */
void*vptr;
vptr=&n[0];
printf("\n%d",*(int*)vptr);

vptr=&ch;
printf("\n%c",*(char*)vptr);      /* type casting to char /*


char*str="Ongole";
vptr=str;
printf("\n%s",(char*)vptr);
printf("\n%c",*(char*)vptr);

/* dynamically allocating 10b memory to pointer */

ptr=(int*)malloc(sizeof(int)*5);


/* deleting memory */
free(ptr);

}