c++编程作业

[youngtree003]

请高手用c++编一下啊：输入年月日，问这是一年的第几天？要考虑闰年，判断月日的合法性

如输入2008，3，18 输出为78

[ttlyfast]

汗

[hcon_1755]

用几个if 语句就出了.....
多几个循环

[zhb200692279]

判断闰年
1.能被4整除，但不能被100整除
2.能被400整除

[zhb200692279]

闰年用来知道2月是28天还是29天，
其他月份的天数是固定的。
可以用switch
case 结构

[aini10011]

编程要先自己多动手做,这个问题满基础的,
LZ应该能自己搞定的!

[太乙]

以前写个个java代码，你看着改改~

//import java.util.GregorianCalendar;
import java.io.*;
//import java.util.Calendar;
import java.util.*;
public class Data {

	/**
	 * @param args
	 */
	private int month;
	private int year;
	public Data(int year,int month)
	{
		this.year=year;
		this.month=month;
	}
	private int GetDayNum()
	{
		int[] days={31,28,31,30,31,30,31,31,30,31,30,31};
		GregorianCalendar cal=new GregorianCalendar(year,month,1);
		if(cal.isLeapYear(year)&&month==2)
			return days[month-1]+1;
		else return days[month-1];
	}
	private int GetFirstDay()
	{
		Calendar cal=Calendar.getInstance();
		cal.set(year, month-1,1);
		return cal.get(Calendar.DAY_OF_WEEK);
		
	}
	public void ExportData()
	{
		System.out.println(year+"--"+month+":\n");
		System.out.print("周日	周一	周二	周三	周四	周五	周六\n");
		int spaces=GetFirstDay()-1;
		for(int i=1;i<=spaces;i++)
		{
			System.out.print("	");
		}
		/**
		 * print days
		 */
		int days=GetDayNum();
		for(int d=1;d<=days;d++)
		{
			System.out.print(d+"	");
			if((d+spaces)%7==0)
			{
				System.out.print("\n");
			}
		}
		
	}
	public static void main(String[] args) throws NumberFormatException, IOException {
		// TODO Auto-generated method stub
		Date now = new Date(System.currentTimeMillis());//
		System.out.println("Begin:		(	now, time is	"+now+"	)");
		System.out.println("Please input the year you want to lookup:");
		BufferedReader stin = new BufferedReader(new InputStreamReader(System.in));
		int year = Integer.parseInt(stin.readLine());
		System.out.println("Please input the month you want to lookup:");
		//BufferedReader stin = new BufferedReader(new InputStreamReader(System.in));
		int month = Integer.parseInt(stin.readLine());
		Data dt=new Data(year,month);
		dt.ExportData();
	}

}

[quchan]

int DayofYear(int iYear , int iMonth , int iDay)
{
int iResult = 0 ;
int DayofMonth[12] = {31 , 28 , 31 , 30 , 31 , 30 , 31 , 31 , 30 , 31 , 30 , 31};
if ( iYear%400 == 0 || iYear%100 != 0 && iYear%4 == 0 )
DayofMonth[1] = 29;
if ( iMonth > 12 || iMonth < 1 )
return 0;
while ( iMonth-- > 1 )
{
iResult += DayofMonth[iMonth - 1];
}
iResult += iDay;


return iResult;
}

[qmm161]

每月天数用数组实现比较好！

[sunnywyg]

其实7楼的才是正解

[sunnywyg]

#include<iostream>
using namespace std;
int main()
{
int year,mon,day,num=0;
cin>>year>>mon>>day;
int month[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
int temp=0;
if(year%400==0) temp=1;
else if(year%100==0) temp=0;
else if(year%4==0) temp=1;
else temp=0;
month[2]+=temp;
for(int i=0;i<mon;i++) num+=month[i];
num+=day;
cout<<num<<endl;
system("pause");
}


DEV下通过

[happyhpy]

没事干就帮你编了个 水平有限~

用if()语句的方法:

#include<iostream>
using namespace std;
int main()
{
cout<<"请输入年、月、日：";
int y,m,d;
cin>>y>>m>>d;
int er,n=0;
if((y%4==0&&y%100!=0)||(y%400==0))
er=29;
else
er=28;
if(y<=0||m<=0||m>12||d<=0||(((m<=7&&m%2==1)||(m>=8&&m%2==0))&&d>31)||(((m<=7&&m%2==0)||(m>=8&&m%2==1))&&d>30)||(m==2&&d>er))
{
cout<<"error!"<<endl;return -1;
}
else
if(m>=3&&m<=7)n=31*(m/2)+30*((m-3)/2)+d+er;
else
if(m>7)n=31*4+30*2+31*((m-7)/2)+30*((m-8)/2)+er+d;
else
n=31*(m-1)+d;
cout<<"这是这年的第"<<n<<"天。"<<endl;
return 0;
}


用switch()语句的方法:

#include<iostream>
using namespace std;
int main()
{
int er,year,month,day,sum=0;
cout<<"请输入年月日：";
cin>>year>>month>>day;
if((year%4==0&&year%100!=0)||(year%400==0))
er=29;
else
er=28;
if(year<=0||month<=0||month>12||day<=0||(((month<=7&&month%2==1)||(month>=8&&month%2==0))&&day>31)||(((month<=7&&month%2==0)||(month>=8&&month%2==1))&&day>30)||(month==2&&day>er))
{
cout<<"error!"<<endl;return -1;
}
for(int num=1;num<month;num++)
{
switch(num)
{
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:sum+=31;break;
case 4:
case 6:
case 9:
case 11:sum+=30;break;
case 2:sum+=er;break;
}
}
sum=sum+day;
cout<<"这天是这年的第"<<sum<<"天。"<<endl;
return 0;
}

[RookieAC]

to lz：

这种基础的俄作业题一定要自己编写
否则到大4毕业你就会后悔了！！！

当然，家里有关系或者不想搞计算机的话，就当我没说

[clhposs]

利用循环加数组更加简便一些

[herman~~]

这个题有空玩玩不错