#include<stdio.h>
#include<string.h>
//#include<windows.h>
int Leap_Year_Mon[12] = { 31,29,31,30,31,30,31,31,30,31,30,31 };
int Mon[12] = { 31,28,31,30,31,30,31,31,30,31,30,31 };
char Weeks[7][5] = { "Sun","Mon","Tue","Wed","Thu","Fri","Sat" };
//定义一个年，月，日结构体；
typedef struct _Distance
{
int year;
int mon;
int day;
}Distance;
int Dis(int year,int mon)
{
int i, j;
int Days_Sum = 0;
int temp_Weeek = 0;
Distance dis;
dis.year = 1970;
dis.mon = 1;
dis.day = 1;
//把键盘输入的年份距1970年的天数统计出来给Days_Sum；
for (i = dis.year; i <year; i++)
{
if (Leap_Year(i))
{
Days_Sum += 366;
}
else
{
Days_Sum += 365;
}
}
for (i = 0; i < mon-1; i++)
{
if (Leap_Year(year))
{
Days_Sum += Leap_Year_Mon[i];
}
else
{
Days_Sum += Mon[i];
}
}
//计算键盘键入的年的1月1号的星期；
temp_Weeek = Days_Sum % 7;
return temp_Weeek;
}
int Leap_Year(int year)
{
int flag = 0;
if (year % 400 == 0 || year % 4 == 0 && year % 100 != 0)
flag = 1;
else
flag = 0;
return flag;
}
void print(int judge,int year,int mon,int Pos)
{
int i;
int j = 1;//用来表示日期；
int t = 0;//用来接收输入月份的天数；
int count = 0;//用来记录输出的天数；
if (judge == 1)
{
//找到输入月份是第几个月，有几天；
for (i = 0; i <12; i++)
{
if (i == mon - 1)
{
t = Leap_Year_Mon[i];
break;
}
}
printf("\n\t");
for (i =1;count<t; i++)
{
if (i >= Pos)
{
printf("%2d ", j++);
count++;
if (i % 7 == 0)
printf("\n\n\t");
}
else
{
printf(" ");
}
}
}
else
{
for (i = 0; i <12; i++)
{
if (i == mon - 1)
{
t = Mon[i];
break;
}
}
printf("\n\t");
for (i =1; count<t; i++)
{
if (i >= Pos)
{
printf("%2d ", j++);
count++;
if (i % 7 == 0)
printf("\n\n\t");
}
else
{
printf(" ");
}
}
}
getch();
puts("\n");
}
void Mon_Print(int judge,int year,int mon)
{
int i;
int m = 5; // m用来记录1970年1月1号的位置；
int t1 = 0; //用来接收键盘键入的年份和月份距离1970年的距离；
int Day_count = 0; //用来计算键盘键入的年份和月份距离1月1号的天数；
//system("cls");
//输出才日历星期；
printf("\n\t\t%4d年%02d月\n", year, mon);
printf("\t");
for (i = 0; i <7; i++)
{
printf("%s ", Weeks[i]);
}
puts("");
t1 = Dis(year, mon); //找到接收键盘键入的年份和月份的1月1号的星期距离1970年的距离；
switch (t1)
{
case 0:
print(Leap_Year(year),year,mon,m);
break;
case 1:
print(Leap_Year(year), year, mon, m+1);
break;
case 2:
print(Leap_Year(year), year, mon,m+2);
break;
case 3:
print(Leap_Year(year), year, mon, m-4);
break;
case 4:
print(Leap_Year(year), year, mon, m-3);
break;
case 5:
print(Leap_Year(year), year, mon, m-2);
break;
case 6:
print(Leap_Year(year), year, mon, m-1);
break;
default:
break;
}
}
int main(void)
{
int year = 0;
int mon = 0;
int t = 0;
int flag = 1;
char ch;
printf("请输入年份和月份：\n");
scanf("%d%d", &year, &mon);
while (flag==1)
{
if (year >= 1970)
{
t = Leap_Year(year);
Mon_Print(t, year, mon);
}
else
{
printf("你输入的年份有错误！\n");
printf("请输入年份和月份：\n");
scanf("%d%d", &year, &mon);
}
printf("请问是否还要输出日历：Y/y---是，N/n---否\n");
fflush(stdin);
getchar();
ch = getchar();
if (ch == 'Y' || ch == 'y')
{
flag = 1;
printf("请输入年份和月份：\n");
scanf("%d%d", &year, &mon);
}
else
flag = 0;
}
return 0;
}