#include <stdio.h>

int main() {
int a=10,b=20;
int *ptr;
ptr=&a;
printf("value of ptr:%d\n",*ptr);
*ptr=20;
printf("new value of ptr:%d\n",a);
int arr[3]={10,20,30};
int *p=arr;
for(int i=0;i<3;i++){
 printf("Arithmetic:%d\n",i,*(p+i));
}
p++;
printf("value of arr[1]:%d\n",*p);
p++;
printf("value of arr[2]:%d\n",*p);
return 0;
}