Answer Posted / lijun li

#include <stdio.h>

typedef struct list
{
int data;
struct list * next;
} LIST;

LIST* reverse(LIST *head)
{
LIST* temp;
LIST* temp1;

if (head == NULL || head->next == NULL)
return head;
else
{
temp = head->next;
head->next = NULL;
while(temp)
{
temp1 = temp->next;
temp->next = head;
head = temp;
temp = temp1;
}

return head;
}
}

int main(int argc, char ** argv)
{
int i=0;
LIST* head = NULL;
LIST* node = NULL;
int count;

if (argc < 2) printf("usage: a.out <count>");
else count = atoi(argv[1]);

for (i=0;i<count;i++)
{
node = (LIST*)calloc(sizeof(LIST));
node->data = i;
node->next = head;

head = node;
}

node = head;
while(node)
{
printf("before %d\n", node->data);
node = node->next;
}

head = reverse(head);
printf("after head=%d\n", head->data);
node = head;
while(node)
{
printf("after %d\n", node->data);
node = node->next;
}
}

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