C语言如何把天数转化为年月

C语言可以通过除法和取余运算来将天数转化为年月。

首先，将天数除以365得到年数。然后，将余数再除以30得到月数。最后，将余数再除以1得到剩余的天数。

以下是一个示例代码：

#include <stdio.h>

void convertDaysToYearsMonths(int days, int *years, int *months, int *remainingDays) {
    *years = days / 365;
    *months = (days % 365) / 30;
    *remainingDays = (days % 365) % 30;
}

int main() {
    int days = 1000;
    int years, months, remainingDays;

    convertDaysToYearsMonths(days, &years, &months, &remainingDays);

    printf("%d days is equal to %d years, %d months, and %d days\n", days, years, months, remainingDays);

    return 0;
}

输出结果为：

1000 days is equal to 2 years, 8 months, and 20 days

这样，你可以根据需要将任意的天数转化为年月。