#include <stdio.h>
#include <sys/fcntl.h>

int a = 2;
int b = 3;

int arr[] = { 1, 2, 3, 4 };

int main() {
    int i,sum=0;
    printf("Hello, World 0x%x + 0x%x = 0x%x\n",a,b,a+b);
    
    for(i=0;i<sizeof(arr)/sizeof(arr[0]);sum+=arr[i],i++)
        printf("arr[0x%x]: 0x%x + 0x%x = 0x%x\n",i,sum,arr[i],sum+arr[i]);
    printf("Grand total: 0x%x\n",sum);
    for(i=a+b;i>=0;i--)
        printf("0x%x ...\n",i);
    printf("Goodbye\n");
    return 0;
}