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年历显示（修改）.c

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+#include<stdio.h>
+#include<time.h>
+void menu();
+void year_calendar();
+void year_month_calendar();
+void year_month_day_calendar();
+int main()
+{
+int choice;
+menu();
+printf("请选择你要的日历服务：");
+scanf("%d",&choice);
+switch(choice)
+{
+case 1:year_calendar();break ;
+case 2:year_month_calendar();break;
+case 3:year_month_day_calendar();break;
+}
+
+return 0;
+}
+
+
+
+void menu()
+{
+printf("\n-------------------------------------------------------\n");
+printf("                  欢迎来到日历查询系统                    \n");
+printf("                   1:查询某年日历                        \n");
+printf("                   2:查询某年某月的日历                  \n");
+printf("                   3:查询某年月日的日历信息              \n");
+printf("                   4:退出                                \n");
+printf("-------------------------------------------------------\n");
+}
+
+
+void year_calendar()
+{
+int year,day,i,j,k,n,m,q,month_one_weekday[13];//day--到今年一月一日前共多少天； month_one_weekday[13]--每个月1号是星期几；
+int month_day[13]; //month_day[13]---查询当年每月共计多少天。
+printf("请输入你要查询日历的年份：");
+scanf("%d",&year);
+day=0;
+for(i=1;i<=year-1;i++)
+{
+if( year%400==0 || (year%4==0&&year%100!=0) )
+n=366;
+else n=365;
+day=day+n;
+}
+month_day[0]=0;
+for(i=1;i<=12;i++)
+{
+switch(i)
+{
+case 1:case 3:case 5:case 7:
+case 8:case 10:case 12: month_day[i]=31;break;
+case 4:case 6:case 9:case 11: month_day[i]=30;break;	
+case 2:if( year%400==0 || (year%4==0&&year%100!=0) )
+month_day[i]=29;
+else month_day[i]=28;
+break;	
+}
+day=day+month_day[i-1];
+if((day+1)%7==0) 
+month_one_weekday[i]=7;
+else month_one_weekday[i]=(day+1)%7;//month_one_weekday[i]:第i个月的第一天是星期几
+
+
+}
+for(i=1;i<=12;i++)//每循环一次输出一个月的日历
+{
+printf("\n\n");
+printf("\n%2i月\n\tSun\tMon\tTue\tWed\tThur\tFri\tSat\n",i);
+for(j=1,m=0;j<=month_day[i];j++)//j:每个月的每一天； ?m：已经输出的天数
+{
+
+
+if(j==1)
+{
+
+q=month_one_weekday[i]-1;
+for(k=1;k<=q;k++)
+printf("\t");
+printf("\t%d\t",j);m=q+1;
+}
+else { printf("%d\t",j);m++;}
+if(m%7==0)
+printf("\n\t ");
+}
+
+}
+printf("\n");
+main();
+}
+
+
+void year_month_calendar()
+{
+int year,month,day=0;
+int i,j,k,n,m,q;
+int month_day[13],month_one_weekday[13];
+printf("\n请输入要查询日历的年月：");
+scanf("%d%d",&year,&month);
+day=0;
+for(i=1;i<=year-1;i++)
+{
+if( year%400==0 || (year%4==0&&year%100!=0) )
+n=366;
+else n=365;
+day=day+n;
+}
+month_day[0]=0;
+for(i=1;i<=12;i++)
+{
+switch(i)
+{
+case 1:case 3:case 5:case 7:
+case 8:case 10:case 12: month_day[i]=31;break;
+case 4:case 6:case 9:case 11: month_day[i]=30;break;	
+case 2:if( year%400==0 || (year%4==0&&year%100!=0) )
+month_day[i]=29;
+else month_day[i]=28;
+break;	
+}
+day=day+month_day[i-1];
+if((day+1)%7==0) month_one_weekday[i]=7;
+else month_one_weekday[i]=(day+1)%7;//month_one_weekday[i]:第i个月的第一天是星期几
+}
+printf("%d年的第%d月日历是:\n",year,month);
+printf("要查询的当月共计多少天：%d\n",month_day[month]);
+printf("\n%2i月：Sun\tMon\tTue\tWed\tThur\tFri\tSat\n",month);
+for(j=1,m=0;j<=month_day[month];j++)//j:每个月的每一天； ?m：已经输出的天数
+{
+if(j==1)
+{
+
+q=month_one_weekday[month]-1;
+for(k=1;k<=q;k++)
+printf("\t");
+printf("\t%d\t",j);m=q+1;
+}
+else { printf("%d\t",j);m++;}
+if(m%7==0)
+printf("\n\t");
+}
+printf("\n");
+main();
+}
+
+
+
+
+void year_month_day_calendar() 
+{
+int year,month,dayy,day,day1,day2,weekday,flag,n1,n2,n,i;//n--距离今天还有多少天，dayy--输入的day
+int month_day[13];
+struct tm *local;
+time_t t;
+printf("\n请输入查询的年月日：");
+scanf("%d%d%d",&year,&month,&dayy);
+printf("输入的日期是：%d年%d月%d日！",year,month,dayy);
+if(month==1)
+	{
+		if(dayy==1)
+		  printf("元旦");
+	}
+	else if(month==2)
+	{
+		if(dayy==14)
+		  printf("情人节"); 
+	}
+	else if(month==3)
+	{
+		switch(dayy)
+		{
+			case 8:printf("妇女节");break;
+			case 12:printf("植树节");break;
+		}
+	}
+	else if(month==4)
+	{
+		if(dayy==1)
+		  printf("愚人节"); 
+	}
+	else if(month==5)
+	{
+		switch(dayy)
+		{
+			case 1:printf("劳动节");break;
+			case 4:printf("青年节");break;
+		}
+	}
+	else if(month==6)
+	{
+		if(dayy==1)
+		  printf("儿童节"); 
+	}
+	else if(month==7)
+	{
+		if(dayy==1)
+		  printf("建党节"); 
+	}
+	else if(month==8)
+	{
+		if(dayy==1)
+		  printf("建军节"); 		
+	} 
+	else if(month==9)
+	{
+		if(dayy==10)
+		  printf("教师节");
+	}
+	else if(month==10)
+	{
+		if(dayy==1)
+		  printf("国庆节"); 
+	}
+	else if(month==11)
+	{
+		;
+	}
+	else
+	{
+		if(dayy==25)
+		  printf("圣诞节");
+	}
+day=0;
+for(i=1;i<=year-1;i++)
+{
+if( year%400==0 || (year%4==0&&year%100!=0) )
+n=366;
+else n=365;
+day=day+n;
+}
+day1=day;
+month_day[0]=0;
+for(i=1;i<=12;i++)
+{
+switch(i)
+{
+case 1:case 3:case 5:case 7:
+case 8:case 10:case 12: month_day[i]=31;break;
+case 4:case 6:case 9:case 11: month_day[i]=30;break;	
+case 2:if( year%400==0 || (year%4==0&&year%100!=0) )
+month_day[i]=29;
+else month_day[i]=28;
+break;	
+}
+}
+for(i=1,n1=0;i<=month-1;i++)
+day1=day1+month_day[i];
+day1=day1+dayy;
+n1=day1; //n1--公元1年1月1日，到输入日期的天数；
+
+
+t=time(NULL);
+local=localtime(&t);
+year=local->tm_year+1900;
+month=local->tm_mon+1;
+dayy=local->tm_mday;
+printf("\n今天的日期是：%d年%d月%d日。\n",year,month,dayy);
+
+
+day2=day;
+for(i=1;i<=12;i++)
+{
+switch(i)
+{
+case 1:case 3:case 5:case 7:
+case 8:case 10:case 12:  month_day[i]=31;break;
+case 4:case 6:case 9:case 11: month_day[i]=30;break;	
+case 2:if( year%400==0 || (year%4==0&&year%100!=0) )
+month_day[i]=29;
+else month_day[i]=28;
+break;	
+}
+}
+for(i=1,n2=0;i<=month-1;i++)
+day2=day2+month_day[i];
+day2=day2+dayy;
+n2=day2; //n2--公元1年1月1日，到当前日期的天数；
+
+if(n2>n1)
+printf("输入日期距离当前系统日期还有%d天！\n",n2-n1);
+else
+printf("输入日期距离当前系统日期还有%d天！\n",n1-n2);
+
+ int week;
+week=n1%7-1;
+switch(week)
+	{
+		case 0:
+			{
+			printf("星期日"); 
+			break;
+		    }
+		case 1:
+			{
+			printf("星期一"); 
+			break;
+		    }
+		case 2:
+			{
+			printf("星期二"); 
+			break;
+		    }
+		case 3:
+			{
+			printf("星期三");
+			break;
+		    }
+		case 4:
+			{
+			printf("星期四");
+			break;
+		    }
+		case 5:
+			{
+			printf("星期五");
+			break;
+		    }
+		case 6:
+			{
+			printf("星期六"); 
+			break;
+		    }
+	}
+printf("\n");
+main();
+
+}
+