tongxinglu.c

c语言版通讯录（数据结构：链表）实现的功能有增加、删除、修改、查询等

/* Note:Your choice is C IDE */
#include <stdio.h>
#define null 0
#define Len sizeof(struct student)

struct student
{long num;
 float score;
 struct student *next;
};
int n;

struct student *creat(void)
{struct student *head;
 struct student *p1,*p2;
 float s;
 n=0;
 p1=p2=(struct student *)malloc(Len);
 scanf("%ld,%f",&p1->num,&s);
 p1->score=s;
 head=null;
 while(p1->num!=0)
 {n=n+1;
  if(n==1) head=p1;
  else p2->next=p1;
  p2=p1;
  p1=(struct student *)malloc(Len);
  scanf("%ld,%f",&p1->num,&p1->score);
 }
 p2->next=null;
 return(head);
}  

void print(struct student *head)
{struct student *p;
 printf("\nnow,these %d records are:\n",n);
 p=head;
 if(head!=null)
 do
 {printf("%ld,%5.1f\n",p->num,p->score);
  p=p->next;
 }while(p!=null);
}

struct student *del(struct student *head,long num)
{struct student *p1,*p2;
 if(head==null){printf("\nlist null!");return(head);}
 p1=head;
 while(num!=p1->num&&p1->next!=null)
 {p2=p1;p1=p1->next;}
 if(num==p1->num)
  {if(p1==head)head=p1->next;
   else p2->next=p1->next;
   printf("delete:%ld\n",num);
   n=n-1;
  }
 else printf("%ld not been found!\n",num);
 return(head);
}

struct student *insert(struct student *head,struct student *stud)
{struct student *p0,*p1,*p2;
 p1=head;
 p0=stud;
 if(head==null)
  {head=p0;p0->next=null;}
 else
  {while((p0->num>p1->num)&&(p1->next!=null))
  	{p2=p1;p1=p1->next;
  	}
  	if(p0->num<p1->num)
  	{if(head==p1)head=p0;
  	 else p2->next=p0;
  	 p0->next=p1;
  	}
  	else
  	{p1->next=p0;p0->next=null;}
  }
 n=n+1;
 return(head);
}

main()
{struct student *head,*stu;
 long del_num;
 printf("input records:\n");
 head=creat();
 print(head);
 printf("\ninput the delected number:");
 scanf("%ld",&del_num);
 while(del_num!=0)
 {head=del(head,del_num);
  print(head);
  printf("input the deleted number:");
  scanf("%ld",&del_num);
 }
 printf("\ninput the inserted record:");
 stu=(struct student *)malloc(Len);
 scanf("%ld,%f",&stu->num,&stu->score);
 while(stu->num!=0)
 {head=insert(head,stu);
  print(head);
  printf("input the insert record :");
  stu=(struct student *)malloc(Len);
  scanf("%ld,%f",&stu->num,&stu->score);
 }
}