some basics

. has precedence over *. So, while pointing to a member of a structure m with pointer p, we write it as p->m which can also be written as (*p).m . This looks messy so people prefer writing p->m.
*p1 = *p2 copies the structure pointed by p2 into that of p1, but
p1 = p2 makes p1 to point to the structure pointed by p2.

Now,
lets build a linked list dynamically.


void add(char * item, struct list *oldhead)
{
struct list *new = malloc(sizeof(struct list));
if(new == NULL)
{
printf("out of mem\n");
exit(1);
}
new->item = item;
new->next = oldhead;
head=new;
}

int main()
{

struct list

{

char *item;

struct list *next;

};

struct list *head = NULL;

add("hi",head);

}

BTW this piece of C code interested me


#include
int main()
{
int width = 9;
printf("%10d\n",1);
printf("%*d",width,1);
}

Mainly using a * before d to decide the width run time.

printf vs fprintf

printf prints output in STDOUT whereas fprintf we can print in user defined stream
for ex:
FILE *f = fopen("hi.txt","w");
fprintf(f,"%s","Hello");