变位词实现 编程珠玑一处错误

书中只实现了单词内部的排序而求得标记词，而并未实现单词之间的排序，所以运行结果按不符合作者预期结果，可能是作者的一个疏忽。

完善后代码如下：

#include <stdio.h>
#include <string.h>
#define WORD_MAX_LENGTH 100
#define DICT_NUM 100

char word[DICT_NUM][WORD_MAX_LENGTH], word_sign[DICT_NUM][WORD_MAX_LENGTH], old_word_sign[WORD_MAX_LENGTH];
int count = 0;

int char_cmp(char *x, char *y)
{
    return *x - *y;
}

int str_compare(char *x, char *y )
{
    return strcmp(x,y);
}

int sign_and_sort(char *input_file_name, char *output_file_name)
{
    FILE *fp_input, *fp_output;
    int i = 0;
    if ((fp_input = fopen(input_file_name, "r")) == NULL || (fp_output = fopen(output_file_name, "w")) == NULL)
    {
        printf("cannot access the file!");
        exit(0);
    }
    
    while (fscanf(fp_input, "%s", word[count]) != EOF)
    {
        strcpy(word_sign[count], word[count]);
        qsort(word_sign[count], strlen(word_sign[count]),sizeof(char), char_cmp);
        strcat(word_sign[count], ": ");
        strcat(word_sign[count], word[count]);
        count++;    
    }
    
    qsort(word_sign, count,sizeof(word_sign[count]), str_compare);
    for (i = 0;i < count; i++)
        fprintf(fp_output,"%s\n", word_sign[i]);
    
    fclose(fp_input);
    fclose(fp_output);
    return 0;            
}

int squash(char *input_file_name, char *output_file_name)
{
    FILE *fp_input, *fp_output;
    int linenumber = 0;
    count = 0; 
    strcpy(old_word_sign, "");
    if ((fp_input = fopen(input_file_name, "r")) == NULL || (fp_output = fopen(output_file_name, "w")) == NULL)
    {
        printf("cannot access the file!");
        exit(0);
    }
    
    while (fscanf(fp_input, "%s %s", word_sign[count], word[count]) != EOF)
    {
        if (strcmp(old_word_sign, word_sign[count]) != 0 && linenumber > 0)
            fprintf(fp_output, "\n");
        strcpy(old_word_sign, word_sign[count]);
        linenumber++;
        fprintf(fp_output, "%s ", word[count++]);
    }
    
    fclose(fp_input);
    fclose(fp_output);
    return 0;
}

int main()
{
    sign_and_sort("dict.txt", "mid.txt");
    squash("mid.txt", "result.txt");
    return 0;
}

运行过程及结果：