void main(){ struct date { int year;int month;int day;}date;int i,leap;int days=0;printf("请输入年月日:");scanf("%d %d %d",&date.year,&date.month,&date.day);if((date.year%4==0&&date.year%100!=0)||date.year%400==0)leap=1;for(i=1;i<date.month;i++){ i...