#include <stdio.h>
int main() {
   int a=10;
   int *ptr;
   ptr =&a;
   printf("value pointed by ptr:%d\n",*ptr);
    *ptr=20;
    printf("New value of a a:%d\n",a);
    int arr[3]={10,20,30};
    int *p;
    p=arr;
    for(int i=0;i<3;i++){
        printf("Arithmetic:%d\n",i,*(p+i));
    }
    p++;
    printf("value ot arr[0]:%d\n",*p);
    p++;
    printf("value ot arr[1]:%d\n",*p);
    p++;
    printf("value ot arr[2]:%d\n",*p);
    p++;
}