用c语言统计一篇文章中每个单词出现的次数

以下是用C语言实现统计文章中每个单词出现次数的示例代码：

#include <stdio.h>
#include <string.h>
#include <ctype.h>

#define MAX_WORD_LENGTH 50
#define MAX_WORDS 1000

int main() {
    char article[10000];
    printf("请输入文章：\n");
    fgets(article, 10000, stdin);
    
    char words[MAX_WORDS][MAX_WORD_LENGTH];
    int freq[MAX_WORDS] = {0};
    int num_words = 0;
    
    char *p_word = strtok(article, " ,.\n");
    while (p_word != NULL && num_words < MAX_WORDS) {
        strncpy(words[num_words], p_word, MAX_WORD_LENGTH);
        words[num_words][MAX_WORD_LENGTH - 1] = '\0';
        for (int i = 0; i < strlen(words[num_words]); i++) {
            words[num_words][i] = tolower(words[num_words][i]);
        }
        freq[num_words]++;
        num_words++;
        
        p_word = strtok(NULL, " ,.\n");
        while (p_word != NULL && strlen(p_word) == 1 && ispunct(p_word[0])) {
            p_word = strtok(NULL, " ,.\n");
        }
        
        for (int i = 0; i < num_words - 1; i++) {
            if (strcmp(words[i], words[num_words - 1]) == 0) {
                freq[i]++;
                num_words--;
            }
        }
    }
    
    printf("单词\t\t出现次数\n");
    printf("=========================\n");
    for (int i = 0; i < num_words; i++) {
        printf("%-20s%d\n", words[i], freq[i]);
    }

    return 0;
}

该程序首先读入文章，然后将文章分解为单词。对于每个单词，程序将其转换为小写字母，并在单词列表中查找是否已经出现过。如果出现过，那么该单词的出现次数加1，否则将该单词添加到单词列表中。最后，程序输出每个单词及其出现次数。