#include<stdio.h>
#include<string.h>

#ifdef __unix__

# include <unistd.h>

#define clear() system("clear"); 

#elif defined _WIN32
# include <windows.h>

#define sleep(x) Sleep(1000 * x)

#define clear() system("cls"); 


#endif

int main(int argc, char *argv[]){


    char name[20];

    clear();

    if(argc < 2 ){
        printf("Please Enter You Name: ");
        fgets(name,sizeof(name),stdin);
        sleep(2);
    }
    else{
        strcpy(name, argv[1]);
    }

    printf("Hello %s\n", name);
    sleep(2);

}