justhomework/ex2.cpp

#include <stdio.h>
#include <iostream>
#include <stdlib.h>
#include <time.h>


class Vec
{
  private:
  
    int *v;
    int LEN;
    int USED;


  public:

    Vec(int len)
    {
      LEN=len*2;
      v=new int[LEN];
      USED=9;

      for(int i=0;i<10;i++)
        v[i]=i+1;
      
      for(int i=0;i<10;i++)
        swap(i,rand()%10);
    }

    int get(int a)
    {
      return v[a];
    }

    void put(int a,int value)
    {
      v[a]=value;
    }

    void swap(int a, int b)
    {
        int temp = v[a];
        v[a] = v[b];
        v[b] = temp;
    }

    void expand()
    {
      LEN=LEN*2;
      int *p=new int[LEN];

      for(int i=0;i<=USED;i++)
        p[i]=v[i];
      
      delete[] v;
      v=p;
    }

    void shrink()
    {
      LEN=LEN>>1;
      int *p=new int[LEN];

      for(int i=0;i<=USED;i++)
        p[i]=v[i];
      
      delete[] v;
      v=p;
    }

    int insert(int locate,int value)
    {
      if(locate<0||locate>USED)
        return 1;

      USED++;
      if(USED>=LEN)
        expand();

      for(int i=USED;i>locate;i--)
        v[i]=v[i-1];
      
      v[locate]=value;

      return 0;
    }

    int del(int locate,int value)
    {

      if(locate<0||((USED-value)<0)||((locate+value-1)>USED))
        return 1;

      USED=USED-value;

      for(int i=locate;i<=USED;i++)
        v[i]=v[i+value];

      if( ( (double)USED/(double)LEN )<=0.3 )
        shrink();

      return 0;
    }

    int find(int value)
    {
      int i = 0;
      for(i;i<=USED;i++)
      {
        if(v[i]==value)
        {
          return i;
        }
      }

      return -1;
    }

    void printall()
    {
      for(int i=0;i<USED;i++)
      printf("%d\n",v[i]);
    }

    int getlen()
    {
      return LEN;
    }

    int getused()
    {
      return USED;
    }
};

int main()
{
  srand(time(NULL));

  Vec v(10);
  int temp[10]={0};
  int flag;


  printf("初始化，输出数组\n");
  v.printall();


  while(1)
  {
    printf("选择操作:\n1.插入\n2.删除\n3.查找\n");
    scanf("%d",&flag);

   switch(flag)
   {
    case 1:
      printf("输入秩与待插入数值\n");
      scanf("%d %d",&temp[0],&temp[1]);
      (v.insert(temp[0],temp[1]))?(printf("非法输入\n")):(printf("输出数组\n"));
      v.printall();
      break;

    case 2:
      printf("输入秩与待删除个数\n");
      scanf("%d %d",&temp[0],&temp[1]);
      (v.del(temp[0],temp[1]))?(printf("非法输入\n")):(printf("输出数组\n"));
      v.printall();
      break;

    case 3:
      printf("输入要查找的数值\n");
      scanf("%d",&temp[0]);
      temp[2]=v.find(temp[0]);
      
      (temp[2]==-1)?(printf("无此元素\n")):(printf("秩为%d \n",temp[2]));
      break;

     default:
     printf("返回菜单\n");
   }


  
  
   flag=0;
  }
  return 0;
}