”输入某年某月某日,判断这一天是这一年的第几天“用C语言怎样编程答:intleap(intyear);/*判断是否闰年的函数声明*/ intmonth,day,days,year;intdaytab[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};/*一般年的12个月的天数组成一个数组*/ printf("Pleaseinputdate(year,month,day):");/*提示输入年月日*/ scanf("%d-%d-%d",&year,&month,&day)...