#include <stdlib.h>
#include <stdio.h>
#define null 0
//define the node structure
struct ilist{
int elem;
struct ilist *next;
};
//allocate the memory of target
void createNode(struct ilist **node, int elem){
struct ilist *temp= malloc(sizeof(struct ilist));
temp->elem = elem;
temp->next = null;
/* we cannot change the value of node, because the subroutine is running on a frame, within a copy of the actual parameters are created
* if node is changed here, what changed is the copy
* but we can change the value referenced by node, as the referenced values could be actually be changed.
* everything is pass by value
*/
*node = temp;
return;
}
int main(int argc, char **argv){
//construct a list
struct ilist *list = null;
struct ilist *visitor = null;
int i = 7;
while(i>0){
if(list == null){
createNode(&list, i);
visitor = list;
}
else{
struct ilist *temp = null;
createNode(&temp, i);
list->next = temp;
list = temp;
}
i--;
}
//visit the list
while(visitor != null){
printf("%d\n",visitor->elem);
visitor = visitor->next;
}
return 0;
}
