c 的一些经典算法,满好的,适合初学者. 也可以当作小程序看,对初学者会很有帮助

 
 
用栈模拟商店进货系统  
 


 


#define stacksize 10
#include "stdio.h"
#include <malloc.h>
typedef struct
{int num[stacksize];
 int top;
}seqstack; /*栈定义*/

typedef struct node
{unsigned num;
 struct node *next;
}linkqnode;

typedef struct
{linkqnode *front,*rear;}linkqueue; /*链队列定义*/

void initstack(seqstack *s) /*初始化栈*/
{s->top=-1;}

int push(seqstack *s,int e)/*入栈*/
{if(s->top==stacksize-1){printf("Stack is full!\n");return 0;}
 s->top++;
 s->num[s->top]=e;return 1;
}


int pop(seqstack *s,int *e)/*出栈*/
{if(s->top==-1)return 0;
 *e=s->num[s->top];
 s->top--;
 return 1;
}

void printstack(seqstack *s)/*输出栈中元素，栈底到栈顶*/
{int i;
 for(i=0;i<=s->top;i++)
 printf("%5d",s->num[i]);
 printf("\n");
}

int initqueue(linkqueue *q)/*初始化队列*/
{
 q->front=(linkqnode*)malloc(sizeof(linkqnode));
 if(q->front!=NULL)
 {q->front->next=NULL;
 q->rear=q->front;return 1;
 }
 else return 0;
}

 int enterqueue(linkqueue *q,int e)/*入队*/
 {linkqnode *s;
  s=(linkqnode*)malloc(sizeof(linkqnode));
  if(s!=NULL)
  {s->num=e;q->rear->next=s;s->next=NULL;q->rear=s;return 1;}
  else return 0;
 }

 int delqueue(linkqueue *q,int *e)/*出队*/
 {linkqnode *p;
 if(q->front==q->rear)return 0;
 p=q->front->next;
 q->front->next=p->next;
 if(q->rear==p)q->rear=q->front;
 *e=p->num;
 free(p);return 1;
 }

 main()/*主函数*/
 {seqstack s;
  linkqueue q;
  int goodsnum;
  
  initstack(&s);
  initqueue(&q);
  printf("输入进货商品号，-1结束:");
  scanf("%d",&goodsnum);

  while(goodsnum!=-1)
  {push(&s,goodsnum);scanf("%d",&goodsnum);}

  printf("\n原货架:\n");
  printstack(&s);

  while(s.top!=-1)
   if(pop(&s,&goodsnum))enterqueue(&q,goodsnum);

  while((q.front)->next!=NULL)
  {delqueue(&q,&goodsnum);
   push(&s,goodsnum);
  }
  printf("\n倒置后货架:\n");
  printstack(&s);
  }