when we make a node while programming as soon as the programm finishes it is lost or so to say. at which address
was the node stored cant be know ,unless those address were being stored in some file.even if we store that. it is not neccessary
that the node would be found there when again i run a new programm to search for the nodes which i created in some other programm.there are chances that one or two nodes might still
be found on ram.but if immediatly done.what if i was to find the nodes which i created today after two three days and meanwhile
all my neighbours were watching movies on my computer
certainly the space occupied by the nodes would have been used by the newly run programmes.only way to make a node permanent is to store it on hard-disk.but i dont know how to store some thing on hard disk and is its pattern of accessing the address or memory locations similar to the way we access memory locations on ram.ofcourse when i create a text file it is stored at some permanent memory location that is why i can open it anytime i want to but that is a inbuilt utility of c that it automatically stores it at some address or what ever it does to make it permanently available.but what if i want to store the node somewhere permanently.