[C++知识库]用C语言实现输入某年某月某天，求这个日期在该年的第几天

代码如下：

#include<stdio.h>
int main()
{
	int total;
	int year,leap,day,i,mon;
	int m=0;
	int mon_1[12]={31,29,31,30,31,30,31,31,30,31,30,31};
	int mon_2[12]={31,28,31,30,31,30,31,31,30,31,30,31};
	printf("Please input year:\n");
	scanf("%d",&year);
	if(year%4==0)//判断该年是闰年还是平年
		if(year%100==0)
			if(year%400==0)
				leap=1;
			else
				leap=0;
		else
			leap=1;
	else
		leap=0;					
	printf("Please input month:\n");//求输入在输入月份之前的月份天数总和
	scanf("%d",&mon);
	if(leap==1)
		for(i=1;i<mon;i++)
			m+=mon_1[i];
	if(leap==0)
		for(i=1;i<mon;i++)
			m+=mon_2[i];
	printf("Please input day:\n");//加上该月已过的天数，得到总和
	scanf("%d",&day);
	total=day+m;
	printf("The date is on the %d day of the year\n",total);
	return 0;				
}