//Dem so phan tu duong trong day


#include<stdio.h>
#include<stdlib.h>
//khai bao thu vien
typedef struct pointer
{
  int info;
  struct pointer *link;
} MyType;
//khai bao cau truc

MyType *l,*p;
const n=4;
int d,i;

//khai bao bien
void main() //chuong trinh
{
  l=NULL;
  for(i=1;i<=n;i++)
  {
    p=(MyType *)malloc(sizeof(MyType)); //tao bien dong p va cap bo nho cho p
    printf("\n Phantu %d: ",i);
    scanf("%d",&p->info); // ghi vao info cua p
    if(l==NULL)
    {
      p->link = NULL;
      l=p;
    }
    else {
      p->link =l;
      l=p;
    }
    }

    d=0;
    p=l;
    while(p!=NULL)
    {
      if(p->info > 0) //tim phan tu duong
    d++; // voi moi phan tu duong tim thay tang d len 1
    p=p->link;
    }
    if(d!=0) printf("Day co %d phan tu duong", d);
    else printf("Day da nhap khong co phan tu duong");

}