while (fgets(total, 10000, fp) != NULL) { int blanki[1000] = { -1 };//统计空格出现的位置 if (total[0] == ' ') { j = 0; } if (total[0] != ' ') { j = 1; } int len = strlen(total); for (i = 0; i < len; i++) { if (total[i] >= 'A' && total[i] <= 'z') { count.letter++; } else if (total[i] >= '0' && total[i] <= '9') { count.number++; } else if (total[0] != ' ' && total[i] == ' ') { count.blank++; blanki[j] = i; j++; } else if (total[0] == ' ' && total[i] == ' ' && total[i + 1] == ' ') { count.blank++; } else if (total[0] == ' ' && total[i] == ' ' && total[i + 1] != ' ') { count.blank++; blanki[j] = i; j++; } else if (total[i] == ',' || total[i] == '.') { count.other++; blanki[j] = i; j++; } else { if (total[i] != '\n')count.other++; } } if (total[strlen(total) - 1] == '\n') { blanki[j] = strlen(total) - 1; } else { blanki[j] = strlen(total); } int from, to, sum = 0; i = 1; while (blanki[i] != 0) { from = blanki[i - 1]; to = blanki[i]; for (int q = blanki[i - 1]; q < blanki[i]; q++) { if (total[q] >= 'A' && total[q] <= 'z') { sum++; } } if (sum == blanki[i] - blanki[i - 1] - 1 && sum != 0) { count.word++; } i++; sum = 0; } count.sumchar = count.blank + count.number + count.letter + count.other; word_s += count.word; sumchar_s += count.sumchar; letter_s += count.letter; number_s += count.number; blank_s += count.blank; other_s += count.other; count.sumchar = count.blank = count.number = count.letter = count.other =count.word = 0; }写注释

这段代码用于统计文件中的字符数量、字母数量、数字数量、空格数量、其他字符数量和单词数量。具体实现是通过读取文件中的每一行，然后对每一行进行遍历，统计各种字符的数量，并且通过空格的位置来判断单词的数量。最后将统计结果累加到相应的总计数器中。以下是具体的注释：

while (fgets(total, 10000, fp) != NULL) { //逐行读取文件，直到文件末尾
    int blanki[1000] = { -1 };//统计空格出现的位置
    if (total[0] == ' ') { //如果第一个字符为空格，说明当前行的第一个单词前面没有空格
        j = 0; 
    }
    if (total[0] != ' ') { //如果第一个字符不是空格，说明当前行的第一个单词前面有一个空格
        j = 1; 
    }
    int len = strlen(total); //获取当前行的长度
    for (i = 0; i < len; i++) { //遍历当前行的每一个字符
        if (total[i] >= 'A' && total[i] <= 'z') { //如果当前字符是字母，则字母数量加1
            count.letter++; 
        }
        else if (total[i] >= '0' && total[i] <= '9') { //如果当前字符是数字，则数字数量加1
            count.number++; 
        }
        else if (total[0] != ' ' && total[i] == ' ') { //如果当前字符是空格，并且第一个字符不是空格，说明当前空格是一个新单词的开头
            count.blank++; 
            blanki[j] = i; //记录当前空格出现的位置
            j++; 
        }
        else if (total[0] == ' ' && total[i] == ' ' && total[i + 1] == ' ') { //如果当前字符是连续的两个空格，并且第一个字符是空格，说明当前空格是一个新单词的开头
            count.blank++; 
        }
        else if (total[0] == ' ' && total[i] == ' ' && total[i + 1] != ' ') { //如果当前字符是空格，并且第一个字符是空格，但是后面不是空格，说明当前空格是一个新单词的开头
            count.blank++; 
            blanki[j] = i; //记录当前空格出现的位置
            j++; 
        }
        else if (total[i] == ',' || total[i] == '.') { //如果当前字符是逗号或句号，则其他字符数量加1
            count.other++; 
            blanki[j] = i; //记录当前字符出现的位置
            j++; 
        }
        else { //如果当前字符不是字母、数字、空格、逗号或句号，则其他字符数量加1
            if (total[i] != '\n')count.other++; //注意要排除换行符
        }
    }
    if (total[strlen(total) - 1] == '\n') { //如果当前行以换行符结尾，说明最后一个单词已经统计完毕
        blanki[j] = strlen(total) - 1; 
    }
    else { //如果当前行没有以换行符结尾，说明最后一个单词还没有统计完毕
        blanki[j] = strlen(total); 
    }
    int from, to, sum = 0; 
    i = 1; 
    while (blanki[i] != 0) { //根据空格的位置来计算单词的数量
        from = blanki[i - 1]; 
        to = blanki[i]; 
        for (int q = blanki[i - 1]; q < blanki[i]; q++) { //遍历当前单词的每一个字符
            if (total[q] >= 'A' && total[q] <= 'z') { //如果当前字符是字母，则累加到sum中
                sum++; 
            }
        }
        if (sum == blanki[i] - blanki[i - 1] - 1 && sum != 0) { //如果当前单词的长度等于空格的距离，说明当前单词不包含其他字符
            count.word++; //单词数量加1
        }
        i++; 
        sum = 0; 
    }
    count.sumchar = count.blank + count.number + count.letter + count.other; //计算当前行的字符总数
    word_s += count.word; //将当前行的统计结果累加到总计数器中
    sumchar_s += count.sumchar; 
    letter_s += count.letter; 
    number_s += count.number; 
    blank_s += count.blank; 
    other_s += count.other; 
    count.sumchar = count.blank = count.number = count.letter = count.other =count.word = 0; //清空当前行的统计结果
}