c语言定义一个结构体变量(包括年、月、日),输入一个日期,计算该日在本...答:include <stdio.h> include <stdlib.h> include struct ymd { int Y,M,D;};const short MonthDay[]={0,31,28,31,30,31,30,31,31,30,31,30,31};int YMD_2_JD(int Y, int M, int D){ const short MonthDay[]={0,31,28,31,30,31,30,31,31,30,31,30,31};int JD,i;...