用哈希法组织关键字

#include <stdio.h>
#include <string.h>
#define N 15
#define M 26
int H(char *s)
{
    return ((*s-'a'+1)%M);
}

int main()
{
    char *s[N]= {"if", "while", "for", "case", "do", "break", "else", "struct", "union", "int", "double", "float", "char", "long", "bool"};
    int i, j, k;
    char HT[M][10];
    int Det[M];   //存放探测次数
    for(i=0; i<M; i++)
    {
        HT[i][0]='\0';
        Det[i]=0;
    }
    printf("字符串 key\tH(key)\n");
    printf("------------------------\n");
    for(i=0; i<N; i++)
    {
        j=H(s[i]);  //求哈希值
        printf("%s\t\t%d\n", s[i],j);
        k=0;   //探测次数初值
        while(1)
        {
            k++;    //累加探测次数
            if(HT[j][0]=='\0')   //当不冲突时，直接放到该处
            {
                strcpy(HT[j], s[i]);
                break;
            }
            else    //冲突时，采用线性探查法求下一个地址
            {
                j=(j+1)%M;
            }
        }
        Det[j]=k;
    }
    printf("---------------------\n");
    printf("哈希表\n");
    printf("位置\t字符串\t探查次数\n");
    printf("---------------------\n");
    for(i=0; i<M; i++)
        printf("%d\t%s\t%d\n", i, HT[i], Det[i]);
    printf("---------------------\n");
    k=0;
    for(i=0; i<M; i++)
        k+=Det[i];
    printf("查找成功情况下的平均查找长度 %f\n", 1.0*k/N);
    return 0;
}

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