第五周上级作业

1.package finish;
public class csy {
    public static void main(String[] args) {
           for (int i = 100; i <= 999; i++) {
                int a = i / 1 % 10;//个位
                int b = i / 10 % 10;//十位
                int c = i / 100;//百位
                if (a * a * a + b * b * b + c * c * c == i) {
                    System.out.print(i + " ");
                }

            }
        }
}

2.package finish;
public class csy {
    public static void main(String[] args) {
      for(int i=1;i<=6;i++){
      for (int j=1;j<=i;j++){
           System.out.print(j);
          }
          System.out.println();
         }
        }
    }

package finish;
public class csy {
    public static void main(String[] args) {
        for(int i=1;i<=6;i++){
          for (int j=1;j<=7-i;j++){
               System.out.print(j);
              }
              System.out.println();
             }
            }
        }

package finish;
public class csy {
    public static void main(String[] args) {
        for(int i=1;i<7;i++) {
            for (int k = 1; k <7-i ; k++) {
                System.out.print(" ");
            }
            for(int j=i;j>0;j--) {
                System.out.print(j);
            }
            System.out.println();
        }
    }
}

package finish;
public class csy {
    public static void main(String[] args) {
        for(int i=6;i>0;i--) {
            for(int k=0;k<6-i;k++) {
                System.out.print(" ");
            }
            for(int j=1;j<=i;j++) {
                System.out.print(j);
            }
            System.out.println("");
        }
    }
}

3.package finish;
import java.util.*;
public class csy {
    public static void main(String[] args) {
         int day=0;
            int month=0;
            int year=0;
            int sum=0;
            int leap;
            System.out.println("请输入年，月，日");
            Scanner csy=new Scanner(System.in);
            year=csy.nextInt();
            month=csy.nextInt();
            day=csy.nextInt();
            switch(month)   
            {
            case 1:
                sum=0;break;
            case 2:
                sum=31;break;
            case 3:
                sum=59;break;
            case 4:
                sum=90;break;
            case 5: 
                sum=120;break;
            case 6:
                sum=151;break;
            case 7:
                sum=181;break;
            case 8:
                sum=212;break;
            case 9:
                sum=243;break;
            case 10:
                sum=273;break;
            case 11:
                sum=304;break;
            case 12:
                sum=334;break;
            default:
                System.out.println("请正确的输入年，月，日");break;
                }
            sum=sum+day;
            if(month>=0&&month<=12&&day>=1&&day<=31)
              {
            if(year%400==0||year%4==0&&year%100!=0)
            {   leap=1;
            }else{
                leap=0;
            }
            if(leap==1&&month>2)
            {
                sum++;
                System.out.println(year+"年"+month+"月"+day+"号是这一年的第"+sum+"天。");
            }else {
                System.out.println(year+"年"+month+"月"+day+"号是这一年的第"+sum+"天。");
                    }
                }
            }
        }

4.package finish;
import java.util.*;
public class csy {
    public static void main(String[] args) {
            int a, b, c, d, e, x;
            Scanner sc = new Scanner(System.in);
            System.out.println("输入数字：");
            e = sc.nextInt();
            a = e / 1000;
            b = e / 100 % 10;
            c = e / 10 % 10;
            d = e % 10;
            x = d * 1000 + c * 100 + b * 10 + a;
            System.out.println("反转后数为：" + x);
            }
            }