justhomework/ex2.cpp

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


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

    void expand();

    void shrink();

  public:

    Vec(int len);

    int get(int a);

    void put(int a,int value);

    void swap(int a, int b);

    int insert(int locate,int value);

    int del(int locate,int value);

    int find(int value);

    void printall();

    int getlen();

    int getused();
};


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

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

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

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

  return -1;
}

int Vec::getlen()
{
  return LEN;
}

int Vec::getused()
{
  return USED;
}

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





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;
}