C++程序:给出年月日,计算该日是该年的第几天答:static int day_tab[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};int sum_day(int month, int day){ int i;for(i=1; i<month; i++)day = day + day_tab[i];return day;} int leap(int year){ int leap;leap = (year%4==0&&year%100!=0)|...