C语言经典算法之单链表 C语言, include, 经典

苹果也疯狂

#include<stdlib.h>
#include<stdio.h>
struct roommate
{
char name[20];
long num;
  intage;
char birthplace[20];
struct roommate *next;
};
struct roommate *head,*cthis,*cnew;
void new_record(void)
{
char ch;
char numstr[20];
do
{
cnew=(struct roommate*)malloc(sizeof(struct roommate));
if(head==NULL)
   head=cnew;
else
  {
   cthis=head;
   while(cthis->next!=NULL)
     cthis=cthis->next;
   cthis->next=cnew;
  }
cthis=cnew;
printf("\nenter name:");
gets(cthis->name);
printf("\nenter number:");
gets(numstr);
cthis->num=atol(numstr);
printf("\nenter age:");
gets(numstr);
cthis->age=atoi(numstr);
printf("\nenter birthplace:");
gets(cthis->birthplace);
cthis->next=NULL;
printf("\nprint 'e' to addrecord:");
ch=getchar();getchar();
}while(ch=='e');
cthis->next=head;
}
void listall(void)
{
int i=0;
cthis=head;
  do{
printf("\nrecord number %d\n",i);
printf("name:%s\n",cthis->name);
         printf("num:%ld\n",cthis->num);
printf("age:%d\n",cthis->age);
printf("birthplace:%s\n",cthis->birthplace);
cthis=cthis->next;
}while(cthis!=head);
}
void main()
{
char ch;
int flag=1;
head=NULL;
while(flag)
{
printf("\ntype 'e' to enter new record,");
printf("type 'l' to list all records,");
printf("type 'i' to insert a  record:");
       ch=getchar();getchar();
        switch(ch)
{
case'e':new_record();break;
case'l':listall();break;
        default:flag=0;
}
}
}