C++ 计算两个日期之间的天数答:int DayInYear(int year, int month, int day){ //int _day = 0;int DAY[12]={31,28,31,30,31,30,31,31,30,31,30,31};if(IsLeap(year))DAY[1] = 29;for(int i=0; i<month - 1; ++i){ day += DAY[i];} return day;} int DaysBetween2Date(string date1, string ...