#include<stdio.h>
    #include<stdlib.h>
    #include<fcntl.h>
    #include<unistd.h>
    #include<string.h>

    int main(int argc, char* argv[]) {
    	int f ,l ,x ,n;
		long int i, offset;
		if (argc < 3) {
			fprintf (stdin,"Usage : %s <file><offset> \n",argv[0]);
			exit(1);
		}
		f=open(argv[1],O_RDONLY);
		if (f==1){
			perror("Opening file failed !");
			exit(2);
		}
		i = strtol (argv[2],NULL,0);
		offset = i*sizeof(int);
		l = lseek(f,offset,SEEK_SET);
		if (l==-1){
			perror("lseek fails !");
			exit(3);
		}
		n = read(f,&x,sizeof(int));
		if(n==-1){
			perror("reading file fails !");
			exit(4);
		}
		if (n==0){
			printf("Out of range !\n");
		}else{
			printf("The number at offset %d is 0x%08x --> %d \n",i,x,x);
		}
		close(f);
		exit(0);
	}