prog24.cpp

来自「C++语言程序设计题典」· C++ 代码 · 共 127 行

#include <stdio.h>
#define N 4
int count_day(int,int,int,int);
int leap(int);
struct person
{
	char name[10];
	struct dates
	{
		int year;
		int month;
		int day;
	} date;
	int d;      /*从1900.1.1到出生日的天数*/
};
class compute
{
	struct person st[N];
    int daynum(int,int,int,int,int,int);
    int count_day(int,int,int,int);
    int leap(int);
public:
	void getdata();
	void sort();
	void disp();
};
int compute::daynum(int s_year,int s_month,int s_day,int e_year,
                    int e_month,int e_day)
{
    int year,day,day1,day2;
    if (s_year<e_year)
    {
		day=count_day(s_year,s_month,s_day,0);
        for (year=s_year+1;year<e_year;year++)
			if (leap(year))
				day+=366L;
	        else        
	            day+=365L;
        day+=count_day(e_year,e_month,e_day,1);
	}
    else if (s_year==e_year)
	{
		day1=count_day(s_year,s_month,s_day,1);
	    day2=count_day(e_year,e_month,e_day,1);
	    day=day2-day1;
	}
	else
		day=-1;
	return day;
}
int compute::count_day(int year,int month,int day,int flag)
{
	static int day_tab[2][12]={{31,28,31,30,31,30,31,31,30,31,30,31},
	       {31,29,31,30,31,30,31,31,30,31,30,31}};  
           /*使用二维数组存放各月天数,第一行对应非闰年，第二行对应闰年*/
    int p,i,s;
    if (leap(year))
		p=1;
    else
	    p=0;
    if (flag)
    {
		s=day;
        for (i=1;i<month;i++)
			s+=day_tab[p][i-1];
	}
    else
	{
		s=day_tab[p][month]-day;
        for (i=month+1;i<=12;i++)
			s+=day_tab[p][i-1];
	}
    return(s);
}
int compute::leap(int year)
{
    if (year%4==0 && year%100!=0 || year%400==0)  /*是闰年*/
		return 1;
    else                                          /*不是闰年*/
	    return 0;
}
void compute::sort()
{
	int i,j;
	struct person temp;
	for (i=0;i<N-1;i++)
		for (j=0;j<N-i-1;j++)
		{
			if (st[j].d>st[j+1].d)
			{
				temp=st[j];
				st[j]=st[j+1];
				st[j+1]=temp;
			}
		}
}
void compute::getdata()
{
 	int i;
	for (i=0;i<N;i++)
	{
		printf("输入第%d个学生姓名:",i+1);
		scanf("%s",st[i].name);
		printf("          出生日期:");
		scanf("%d.%d.%d",&st[i].date.year,&st[i].date.month,&st[i].date.day);
		st[i].d=daynum(1900,1,1,st[i].date.year,
                 st[i].date.month,st[i].date.day);
	}
}
void compute::disp()
{
	int i;
	printf("输出结果:\n");
	printf("  姓名    出生日期\n");
	for (i=0;i<N;i++)
		printf("  %-8s%d.%d.%d\n",st[i].name,st[i].date.year,
             st[i].date.month,st[i].date.day);
    printf("\n");
}
void main()
{
	compute obj;
	obj.getdata();
	obj.sort();
	obj.disp();
}