這有一個哈希表設計,針對集體中人名設計一個哈希表,使得平均查找長度不超過R,并完成相應的建表和查表程序.待填入哈希表的人名共有30個,取平均查找的上限為2.哈希函數用除留余數法構造,用線性探測法再散列法或鏈地址法處理沖突.

#include <stdio.h>
#include <conio.h>
#include <ctype.h>
#define L 50 /*定義哈希表長*/
#define M 47 /*定義p值*/
#define N 30 /*定義名單長*/
char z[22];
struct old{char *name;char *py;int k;};
struct old oldlist[L];/*原始表*/
struct hterm
{ char *name;char *py;
int k;int si;
};
struct hterm hlist[L];/*哈希表*/
int i,adr,sum,d;
char ch1;
float average;
/**********************************/
void chash()
{for (i=0;i<L;i++)
{hlist[i].name="";
hlist[i].py="";
hlist[i].k=0;
hlist[i].si=0;
};
for (i=0;i<N;i++)
{ sum=0;
adr=(oldlist[i].k)%M;
d=adr;
if(hlist[adr].si==0)
{hlist[adr].k=oldlist[i].k;
hlist[adr].name=oldlist[i].name;
hlist[adr].py=oldlist[i].py;
hlist[adr].si=1;
}
else
{do
{d=(d+((oldlist[i].k))%10+1)%M;/*偽隨機*/
sum=sum+1;
}
while (hlist[d].k!=0);
hlist[d].k=oldlist[i].k;
hlist[d].name=oldlist[i].name;
hlist[d].py=oldlist[i].py;
hlist[d].si=sum+1;
}
}
}

/***************************************/
void findhlist()
{ int s0;char r,g;
clrscr();/*清屏*/
for (r=0;r<20;r++){z[r]=0;};
gotoxy(1,1);printf("查找：copyright by 姚建飛 2003.6");
gotoxy(5,10);printf("請拼音后回車！");
gotoxy(5,12);scanf("%s",z);
s0=0;
for (r=0;r<20;r++){s0=z[r]+s0;};
gotoxy(5,13); printf("%d",s0);
/*for (i=0;i<L;i++)*/
sum=1;
adr=s0%M;
d=adr;
if(hlist[adr].k==s0)
{
gotoxy(18,18);printf(" ");
gotoxy(18,18);printf("%s",hlist[d].name);
gotoxy(18,19);printf("%s",hlist[d].py);
gotoxy(18,20);
printf("搜索 %d 次",sum);
getch();
}
else
{if (hlist[adr].k==0)
{gotoxy (18,18);
printf("無記錄! ");
getch();
}
else
{g=0;
for (i=0;g==0;i++)
{d=(d+s0%10+1)%M; /*偽隨機*/
sum=sum+1;
if (hlist[d].k==0)
{gotoxy (18,18);
printf("無記錄! ");
g=1;getch();
};
gotoxy(18,18);
printf("%s",hlist[d].name);
gotoxy(18,19);
printf("%s",hlist[d].py);
gotoxy(18,20);
printf("搜索 %d 次",sum);
getch();
if (hlist[d].k==s0)
{ g=1;
gotoxy(18,21);
printf("搜索 %d 次成功!",sum);
getch();
};
};

};

};

}


/***************************************/
void inp() /*輸入表*/
{
char *f;
int r,s0;

oldlist[0].name="桂芳芳";oldlist[0].py="guifanfan";
oldlist[1].name="姚建飛";oldlist[1].py="yaojianfei";
oldlist[2].name="楊揚";oldlist[2].py="yangyang";
oldlist[3].name="朱玉環";oldlist[3].py="zhuyuhuang";
oldlist[5].name="陳曦";oldlist[5].py="chenxi";
oldlist[6].name="張雷";oldlist[6].py="zhanglei";
oldlist[7].name="盛永海";oldlist[7].py="shenyonghai";
oldlist[8].name="陳道全";oldlist[8].py="chengdaoquan";
oldlist[9].name="陸道清";oldlist[9].py="ludaoqing";
oldlist[10].name="龔云祥";oldlist[10].py="gongyunxiang";
oldlist[11].name="孫振興";oldlist[11].py="sunzhenxing";
oldlist[12].name="孫容飛";oldlist[12].py="sunrongfei";
oldlist[13].name="孫明龍";oldlist[13].py="sunminglong";
oldlist[14].name="張浩";oldlist[14].py="zhanghao";
oldlist[15].name="田苗";oldlist[15].py="tianmiao";
oldlist[16].name="姚建中";oldlist[16].py="yaojianzhong";
oldlist[17].name="姚建清";oldlist[17].py="yaojianqing";
oldlist[18].name="姚建華";oldlist[18].py="yaojianhua";
oldlist[19].name="張海峰";oldlist[19].py="yaohaifeng";
oldlist[20].name="陳言號";oldlist[20].py="chengyanhao";
oldlist[21].name="姚秋鋒";oldlist[21].py="yaoqiufeng";
oldlist[22].name="錢鵬程";oldlist[22].py="qianpengcheng";
oldlist[23].name="姚海峰";oldlist[23].py="yaohaifeng";
oldlist[24].name="卞艷";oldlist[24].py="bianyan";
oldlist[25].name="凌蕾";oldlist[25].py="linglei";
oldlist[26].name="李偉";oldlist[26].py="liwei";
oldlist[27].name="黃海燕";oldlist[27].py="huanhaiyan";
oldlist[28].name="劉殿琴";oldlist[28].py="liudianqin";
oldlist[29].name="李云";oldlist[29].py="liyun";

/*
請在此輸入數據,同時修改程序開頭的 M　L N

*/
for (i=0;i<N;i++)
{
s0=0;
f=oldlist[i].py;

for (r=0;*(f+r) != '\0';r++){s0=*(f+r)+s0;};

oldlist[i].k=s0;


};

}

/****************************************/
void dhash() /*顯示哈希表*/
{ char LON=17;
clrscr();
if (LON>L){LON=L;};
gotoxy(1,1);printf("哈希表：copyright by 姚建飛 2003.6");
gotoxy(1,2);printf("地址:");
for(i=0;i<LON;i++)
{gotoxy(1,i+3);
printf("%-3d",i);
};
gotoxy(9,2);printf("關鍵字:");
for(i=0;i<LON;i++)
{gotoxy(10,i+3);
printf("%-6d",hlist[i].k);
};
gotoxy(19,2);printf("姓名:");
for(i=0;i<LON;i++)
{gotoxy(19,3+i);
printf("%s",hlist[i].name);
};
gotoxy(28,2);printf("拼音:");
for(i=0;i<LON;i++)
{gotoxy(28,i+3);
printf("%s",hlist[i].py);
};
gotoxy(40,2);printf("搜索長度:");
for(i=0;i<LON;i++)
{gotoxy(43,i+3);
printf("%2d",hlist[i].si);
};
gotoxy(53,2);printf("H(key):");
for(i=0;i<LON;i++)
{gotoxy(53,i+3);
printf("%2d",(hlist[i].k)%M);
};
average=0;
for (i=0;i<L;i++)
{average=average+hlist[i].si;};
average=average/N;
gotoxy(10,23);
printf("平均搜索長度：ASL(%d)=%f",N,average);

gotoxy(20,24);
printf("任意鍵下一屏!");
ch1=getch();


if (L>15)
{
clrscr();
if (LON>L-15){LON=L-15;};
gotoxy(1,1);printf("哈希表：copyright by 姚建飛 2003.6");
gotoxy(1,2);printf("地址:");
for(i=0;i<LON;i++)
{gotoxy(1,i+3);
printf("%-3d",i+15);
};
gotoxy(9,2);printf("關鍵字:");
for(i=0;i<LON;i++)
{gotoxy(10,i+3);
printf("%-6d",hlist[i+15].k);
};
gotoxy(19,2);printf("姓名:");
for(i=0;i<LON;i++)
{gotoxy(19,3+i);
printf("%s",hlist[i+15].name);
};
gotoxy(28,2);printf("拼音:");
for(i=0;i<LON;i++)
{gotoxy(28,i+3);
printf("%s",hlist[i+15].py);
};
gotoxy(40,2);printf("搜索長度:");
for(i=0;i<LON;i++)
{gotoxy(43,i+3);
printf("%2d",hlist[i+15].si);
};
gotoxy(53,2);printf("H(key):");
for(i=0;i<LON;i++)
{gotoxy(53,i+3);
printf("%2d",(hlist[i+15].k)%M);
};
average=0;
for (i=0;i<L;i++)
{average=average+hlist[i].si;};
average=average/N;
gotoxy(10,23);
printf("平均搜索長度：ASL(%d)=%f",N,average);

gotoxy(20,24);
printf("任意鍵下一屏! ");
ch1=getch();
};
if (L>30)
{
clrscr();
if (LON>L-30){LON=L-30;};
gotoxy(1,1);printf("哈希表：copyright by 姚建飛 2003.6");
gotoxy(1,2);printf("地址:");
for(i=0;i<LON;i++)
{gotoxy(1,i+3);
printf("%-3d",i+30);
};
gotoxy(9,2);printf("關鍵字:");
for(i=0;i<LON;i++)
{gotoxy(10,i+3);
printf("%-6d",hlist[i+30].k);
};
gotoxy(19,2);printf("姓名:");
for(i=0;i<LON;i++)
{gotoxy(19,3+i);
printf("%s",hlist[i+30].name);
};
gotoxy(28,2);printf("拼音:");
for(i=0;i<LON;i++)
{gotoxy(28,i+3);
printf("%s",hlist[i+30].py);
};
gotoxy(40,2);printf("搜索長度:");
for(i=0;i<LON;i++)
{gotoxy(43,i+3);
printf("%2d",hlist[i+30].si);
};
gotoxy(53,2);printf("H(key):");
for(i=0;i<LON;i++)
{gotoxy(53,i+3);
printf("%2d",(hlist[i+30].k)%M);
};
average=0;
for (i=0;i<L;i++)
{average=average+hlist[i].si;};
average=average/N;
gotoxy(10,23);
printf("平均搜索長度：ASL(%d)=%f",N,average);

gotoxy(20,24);
printf("任意鍵下一屏! ");
ch1=getch();
};
if (L>45)
{
clrscr();
if (LON>L-45){LON=L-45;};
gotoxy(1,1);printf("哈希表：copyright by 姚建飛 2003.6");
gotoxy(1,2);printf("地址:");
for(i=0;i<LON;i++)
{gotoxy(1,i+3);
printf("%-3d",i+45);
};
gotoxy(9,2);printf("關鍵字:");
for(i=0;i<LON;i++)
{gotoxy(10,i+3);
printf("%-6d",hlist[i+45].k);
};
gotoxy(19,2);printf("姓名:");
for(i=0;i<LON;i++)
{gotoxy(19,3+i);
printf("%s",hlist[i+45].name);
};
gotoxy(28,2);printf("拼音:");
for(i=0;i<LON;i++)
{gotoxy(28,i+3);
printf("%s",hlist[i+45].py);
};
gotoxy(40,2);printf("搜索長度:");
for(i=0;i<LON;i++)
{gotoxy(43,i+3);
printf("%2d",hlist[i+45].si);
};
gotoxy(53,2);printf("H(key):");
for(i=0;i<LON;i++)
{gotoxy(53,i+3);
printf("%2d",(hlist[i+45].k)%M);
};
average=0;
for (i=0;i<L;i++)
{average=average+hlist[i].si;};
average=average/N;
gotoxy(10,23);
printf("平均搜索長度：ASL(%d)=%f",N,average);

gotoxy(20,24);
printf("任意鍵返回! ");
ch1=getch();
};

}
/**************************************/
void main()
{inp(); /*輸入原表*/
chash ();/*建哈希表*/
a: clrscr();
gotoxy(21,2);
textcolor(GREEN);
cprintf("歡迎使用本程序------------編者:姚建飛");
printf("\n");
gotoxy(22, 4);
textcolor(GREEN);
cprintf(" 1. 顯示哈希表");
printf("\n");
gotoxy(22, 6);
textcolor(GREEN);
cprintf(" 2. 查找");
printf("\n");
gotoxy(22, 8);
textcolor(GREEN);
cprintf(" x. 退出");
printf("\n");
gotoxy(22, 12);
cprintf(" 請輸入選擇: ");
printf("\n");
gotoxy(24,14);
ch1=getch();
if (ch1==0x78){ textcolor(GREEN);
cprintf("謝謝使用本程序,你已經退出本程序!");printf("\n"); exit

();};/*"x":退出*/
if (ch1==0x31){dhash();};/*表的屬性*/
if (ch1==0x32){ findhlist();};/*查找*/
goto a;

}