#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 a:%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 to arr[1]:%d\n",*p);
    return 0;
}