读入一篇英文文章，统计其中的单词，并得到每个单词出现的次数

// 读入一篇英文文章，统计其中的单词，并得到每个单词出现的次数
// 链表的应用  AC
#include <cstring>
#include <cstdio>
#include <cstdlib>

typedef struct _link{
    char* ch;
    int num;
    _link* next;
}link;



int main(int argc,char* argv[]){
    FILE *fp;
    fp = fopen("test0001.txt","r");
    char word[1025];
    int pos = 0;
    char c;
    link *head,*pnow,*ptmp;
    head = pnow = ptmp = NULL;
    while(!feof(fp)){
        c = fgetc(fp);
        if( (c>='a' && c<='z') || (c>='A' && c<= 'Z') || c=='\'' ){
            word[pos++] = c;
        }else if(pos>0){
            word[pos] = '\0';

            //链表遍历，比较链表中的结点值与单词值
            ptmp = head;
            while(ptmp){
                if(strcmp(word,ptmp->ch) == 0){
                    ptmp->num++;
                    break;
                }
                ptmp = ptmp->next;
            }

            //如果链表中没有当前的单词，在链表末尾插入结点
            if(ptmp== NULL){
                ptmp = (link*)malloc(sizeof(link));
                ptmp->ch = (char*)malloc(pos);
                strcpy(ptmp->ch,word);
                ptmp->num = 1;
                ptmp->next = NULL;
                if(pnow){ //当前插入结点为末结点
                    pnow->next = ptmp;
                    pnow = ptmp;
                }else{ //此处为第一次出现单词的时候
                    head = pnow = ptmp;
                }
            }
            pos = 0;

        }

    }

    fclose(fp);
    ptmp = head;
    FILE *fp1 = fopen("test0002.txt","w");
    while (ptmp){
        fprintf(fp1,"%d\t%s\n",ptmp->num,ptmp->ch);
        printf("%d-%s\n",ptmp->num,ptmp->ch);
        ptmp = ptmp->next;
    }
    fclose(fp1);
    return 0;
}