#include <stdio.h>

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