Question

我正在创建一个函数，它接受个人记录（存储在函数参数中的*individual），分离记录以获得人生日，然后函数计算他们的年龄。我遇到的问题是当我使用strrchr搜索生日的记录时，它会在我不希望的时候更改原始值。因此，它不存储Steven, Cortright, 3/1/1940，而是存储Steven, Cortright, 3

我已经尝试了一切我能想到的解决这个问题的方法。以下是我的代码我感谢任何帮助/建议：

char* calcage(char *individual)
  {

    time_t current_time;
    char *c_time_string;
    char *birthday;
    char *bmonth, *bday, *byear;
    int numbmonth, numbday,  numbyear;
    struct tm str_bday;
    time_t time_bday;
    double diff;
    double years;

    double monthscalc;
    int monthsage;
    int yearsage;


    current_time = time(NULL);


    c_time_string = ctime(&current_time);
    birthday = strrchr(individual, ',');
    birthday++;


    bmonth = strtok(birthday, "/");
    bday = strtok(NULL, "/");
    byear = strtok(NULL, "/");

    numbmonth = atoi(bmonth);
    numbday = atoi(bday);
    numbyear = atoi(byear);

    str_bday.tm_year = numbyear - 1900;
    str_bday.tm_mon = numbmonth - 1;
    str_bday.tm_mday = numbday;
    str_bday.tm_hour = 0;
    str_bday.tm_min = 0;
    str_bday.tm_sec = 1;
    time_bday = mktime(&str_bday);

    diff = difftime(current_time, time_bday);
    years = diff / 60 / 60 / 24 / 365.242;

    yearsage = (int) years;


    int inpart = (int) years;
    double months = years - inpart;
    monthscalc = (365.242 * months) / 30.4368;

    monthsage = (int) monthscalc;

    char *calculatedAge = (char *)malloc(50*sizeof(char));
    snprintf(calculatedAge,100,  "You are %d years and %d months old.", yearsage, \
    monthsage);

    return calculatedAge;
  }

Answer 1

问题是strtok，而不是strrchr。 strtok在原始缓冲区中的标记之后放置一个空字节。

Answer 2

而不是strtok使用sscanf来解析字符串：

int month = 0, day = 0, year = 0;
sscanf( birthday, "%d/%d/%d", &month, &day, &year );

这样你就不会搞砸论证

Answer 3

char* calcage(char *individual){
    time_t now = time(NULL);
    struct tm *local = localtime(&now);

    char *temp = strdup(strrchr(individual, ',')+1);//make copy
    char *birthday = temp;
    int bmonth, bday, byear;
    bmonth = atoi(strtok(temp, "/"));
    bday   = atoi(strtok(NULL, "/"));
    byear   = atoi(strtok(NULL, "/"));
    int age = local->tm_year + 1900 - byear -1;
    int lm = local->tm_mon + 1;
    if(bmonth <= lm && bday <= local->tm_mday)
        ++age;
    int mtemp = lm - bmonth;
    if(mtemp < 0 || mtemp == 0 && bday > local->tm_mday)
        mtemp += 12;
    int mage = age * 12 + mtemp;
    char *calculatedAge = realloc(temp, 50);
    snprintf(calculatedAge, 50, "You are %d years and %d months old.", age, mage);
    return calculatedAge;
}

值返回错误的值

3 个答案: