1 struct wordcount//定义一个结构体Wordcount
2 {
3     char *word;
4     int count;
5     struct wordcount *next;
6 };

 1 while (wc)//如果有的话则计数加1
 2 {
 3        if (strcmp(wc->word,buff)==0)
 4       {
 5               wc->count=wc->count+1;
 6               isfinded=1;
 7               break;
 8       }
 9        else
10              wc=wc->next;
11 }

#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>#define MAXLEN 30struct wordcount//定义一个结构体Wordcount
{char *word;int count;struct wordcount *next;
};struct wordcount *head,*wc,*sort,*headsort;
char buff[MAXLEN];
char *zs_c;//buf[]数组用来存放英文字母
int buff_count=0, isfinded;int main()
{FILE *fp;char ch;int i;int k;char filename[20];printf("请输入文件名：\n");scanf("%s",filename);if ((fp=fopen(filename,"r"))==NULL) {printf("不能打开该文件!\n");exit(0);}while ((ch=fgetc(fp))!=EOF)//读取英文文本中的内容if (isalpha(ch)){buff[buff_count++]=tolower(ch);//判断是否为字母若果是则把它放到数组Buff[]if (buff_count>=MAXLEN){printf("单词长度超过最大限度!\n");//判断单词的长度是否超过最长限度
                fclose(fp);return -1;}}else{//若果不是字母，且buff[]中没有单词的话则把其放到Wordcount link中if (buff_count!=0){buff[buff_count]='\0';wc=head;isfinded=0;while (wc)//如果有的话则计数加1
                {if (strcmp(wc->word,buff)==0){wc->count=wc->count+1;isfinded=1;break;}elsewc=wc->next;}if (isfinded==0) {zs_c=(char *)malloc(buff_count);if (zs_c==0){printf("错误!: zs_c !\n");fclose(fp);exit(0);}memcpy(buff,zs_c,buff_count);wc=(struct wordcount *)malloc(sizeof(struct wordcount));if (wc==0){printf("分配有误！\n");fclose(fp);exit(0);}wc->word=zs_c;wc->count=1;wc->next=head;head=wc;}buff_count=0;}}fclose(fp);if (head)//对单词进行排序
    {sort=head->next;head->next=0;while (sort){wc=sort;sort=sort->next;if ((wc->count) > (head->count)){wc->next=head->next;head=wc;}else{headsort=head;while ((headsort->next) && (headsort->next->count > wc->count ))//交换进行排序
                {headsort->count=headsort->next->count;wc->next->count=headsort->next->count;wc->next->count=headsort->count;headsort->word=headsort->next->word;wc->next->word=headsort->next->word;wc->next->word=headsort->word;}}}}while (head)//对结果进行输出
    {wc=head;head=head->next;printf("序号\t单词\t频率\n");for(i=1;i<11;i++)printf("NO%d\t%s\t %d\n",i,wc->word,wc->count);}return 0;
}