编程基本功——判断某天是一年中的第几天

一、分析

二、源码

#include <stdio.h>

int Day(int year, int month, int date)

{

 int months[13] ={0, 31, 0, 31, 30,

 31, 30, 31, 31, 30,

 31, 30, 31};

 int i, days = 0;

 if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0))

 months[2] = 29;

 else

 months[2] = 28;

 for (i = 1; i < month; ++i)

{

 days += months[i];

}

 days += date;

 return days;

}

int main()

{

 printf("the days of 25th May 2010 is %d\n", Day(2010, 5, 25));

 return 0;

}