编程:输入一个年份,判断它是否为闰年,并输出是否为闰年的相关信息。答:include<stdio.h> int ifleapyear(int year);int count(int year,int m, int d, int feb);int main(){ int year,m,d,i;int feb;printf("请输入一个日期:");scanf("%d%d%d",&year,&m,&d);feb=ifleapyear(year);i=count(year,m,d,feb);printf("这是这一年的第%d天",i);ret...