第十四周项目1——验证折半算法

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/*Copyright (c) 2015,烟台大学计算机学院*All right reserved*文件名称:main.cpp*作者:姜延锴*完成日期:2016年12月16日*版本号:v1.0**问题描述:认真阅读并验证折半查找算法。请用有序表{12,18,24,35,47,50,62,83,90,115,134}作为测试序列,分别对查找90、47、100进行测试*输入描述:无*程序输出:测试数据*/
折半算法:
#include <stdio.h>  #define MAXL 100  typedef int KeyType;  typedef char InfoType[10];  typedef struct  {      KeyType key;                //KeyType为关键字的数据类型      InfoType data;              //其他数据  } NodeType;  typedef NodeType SeqList[MAXL];     //顺序表类型    int BinSearch(SeqList R,int n,KeyType k)  {      int low=0,high=n-1,mid;      while (low<=high)      {          mid=(low+high)/2;          if (R[mid].key==k)      //查找成功返回              return mid+1;          if (R[mid].key>k)       //继续在R[low..mid-1]中查找              high=mid-1;          else              low=mid+1;          //继续在R[mid+1..high]中查找      }      return 0;  }    int main()  {      int i,n=11;      int result;      SeqList R;      KeyType a[]= {12,18,24,35,47,50,62,83,90,115,134},x=90;      for (i=0; i<n; i++)          R[i].key=a[i];      result = BinSearch(R,n,x);      if(result>0)          printf("序列中第 %d 个是 %d\n",result, x);      else          printf("木有找到!\n");      return 0;  } 

(2)递归折半算法:
#include <stdio.h>#define MAXL 100typedef int KeyType;typedef char InfoType[10];typedef struct{    KeyType key;                //KeyType为关键字的数据类型    InfoType data;              //其他数据} NodeType;typedef NodeType SeqList[MAXL];     //顺序表类型int BinSearch(SeqList R,int n,KeyType k){    int low=0,high=n-1,mid;    while (low<=high)    {        mid=(low+high)/2;        if (R[mid].key==k)      //查找成功返回            return mid+1;        if (R[mid].key>k)       //继续在R[low..mid-1]中查找            high=mid-1;        else            low=mid+1;          //继续在R[mid+1..high]中查找    }    return 0;}int main(){    int i,n=11;    int result;    SeqList R;    KeyType a[]= {12,18,24,35,47,50,62,83,90,115,134},x=100;    for (i=0; i<n; i++)        R[i].key=a[i];    result = BinSearch(R,n,x);    if(result>0)        printf("序列中第 %d 个是 %d\n",result, x);    else        printf("木有找到!\n");    return 0;}

测试:
{12,18,24,35,47,50,62,83,90,115,134},x=90;
{12,18,24,35,47,50,62,83,90,115,134},x=47;
{12,18,24,35,47,50,62,83,90,115,134},x=100;
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