C语言统计出现次数最多的单词

以下是C语言统计出现次数最多的单词的代码示例：

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

#define MAX_WORD_LEN 100

int main() {
    char str[1000], word[MAX_WORD_LEN], max_word[MAX_WORD_LEN];
    int i, j, len, max_count = 0, count = 0;

    printf("Enter a string: ");
    fgets(str, 1000, stdin);

    len = strlen(str);

    for (i = 0; i < len; i++) {
        if (isalnum(str[i])) {
            word[count++] = tolower(str[i]);
        } else if (count != 0) {
            word[count] = '\0';
            count = 0;
            for (j = 0; j < len; j++) {
                if (strcmp(word, max_word) == 0) {
                    max_count++;
                    break;
                }
            }
            if (j == len) {
                if (max_count == 0) {
                    strcpy(max_word, word);
                    max_count = 1;
                } else if (strcmp(word, max_word) < 0) {
                    strcpy(max_word, word);
                    max_count = 1;
                }
            }
        }
    }

    printf("Most frequent word is '%s' with frequency %d.\n", max_word, max_count);

    return 0;
}