万年历

import java.util.Scanner;
public class Panduan1{
public static void main(String[] args){
   Scanner input=new Scanner(System.in);
   String  shifou;
   int nian,yue,yuann,xinq;
   int zong=0,nianz=0,count=0,tian=0,yuez=0;
  
   do{
        zong=0,nianz=0,count=0,tian=0;
         yuez=0;                    //进行下一次循环时注意给变量清零！
                        
   System.out.println("************************欢迎使用万年历************************\n\n\n");
   System.out.println("请选择年份：\n\n");
   nian=input.nextInt();
   System.out.println("请选择月份：\n\n");
   yue=input.nextInt();
if(nian%4==0&&nian%100!=0||nian%400==0){
        
  System.out.println(nian+"\t\t闰年");  
}else{
      
   System.out.println(nian+"\t\t平年");
}
    switch(yue){
    case 1:
    case 3:
    case 5:
    case 7:
    case 8:
    case 10:
    case 12:
    tian=31;
    System.out.println(yue+"\t\t共"+tian+"天");
    break;
    case 2:
   if(nian%4==0&&nian%100!=0||nian%400==0){
    tian=29;
  System.out.println(yue+"\t\t闰年"+tian+"天");
}else{
  tian=28;
System.out.println(yue+"\t\t平年"+tian+"天");
}
    break;
    case 4:
    case 6:
    case 9:
    case 11:
    tian=30;
   System.out.println(yue+"\t\t共"+tian+"天");
    break;
    default:
    System.out.println("您的月份输入有错！请重新输入。");
     yue=input.nextInt();               
    break;
}



//计算年天


for(yuann=1900;yuann<nian;yuann++){
if(yuann%4==0&&yuann%100!=0||yuann%400==0){
   nianz=nianz+366;
}else{
nianz=nianz+365;
}
}
//计算月天
for(int yu=1;yu<yue;yu++){
if(yu==1||yu==3||yu==5||yu==7||yu==8||yu==10||yu==12){
  yuez=yuez+31;
}else if(yu==2){
   if(nian%4==0&&nian%100!=0||nian%400==0){
  yuez=yuez+29;
}else{
  yuez=yuez+28;
}
}else if(yu==4||yu==6||yu==9||yu==11){
   yuez=yuez+30;
}else{
  break;
}
}

//总差天
  
zong=yuez+nianz;
System.out.println("距离1900年的总天数是：\t"+zong);

//月份第一天星期：

xinq=1+zong%7;

System.out.println("星期日\t"+"星期一\t"+"星期二\t"+"星期三\t"+"星期四\t"+"星期五\t"+"星期六\t");

//显示月份表

  switch(xinq){
  case 0:
   while(count<tian){
    count++;
   System.out.print(count+"\t");
   if(count%7==0){
   System.out.println();
}
}
  break;
   case 1:
   case 2:
   case 3:
   case 4:
   case 5:
   case 6:
   for(int f=1;f<=xinq;f++){
   System.out.print("\t");
}
   while(count<tian){
    count++;
   System.out.print(count+"\t");
   if(count+xinq==7){
   System.out.println();
}else if((count%7==7-xinq)){
   System.out.println();
}
}
break;
default:
System.out.println("您的算法有错!");
break;
}


   System.out.println("是否继续查询y/n:");
   shifou=input.next();
   if(shifou.equals("y")){
    continue;
}if(shifou.equals("n")){
    break;
}else{
    System.out.println("您的月份输入有错！请重新输入。");
     shifou=input.next();
}
  }while(shifou.equals("y"));
System.out.println("程序结束！");
}
}