On the fifth week of the machine operation

1. Print out all the "number of Narcissus", the so-called "Narcissus number" refers to a three-digit number, which is equal to the digits of the cube and the number itself. For example: 153 is a "Narcissus number", because cubic cubic cubic +3 +5 1 = 153. (Knowledge Point: Loops, conditional statements)

import java.util.*;
public class C {
    public static void main(String[] args) {
          // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        int a,b,c,sum=0;
        for(int i=100;i<=999;i++) {
        a=i/100;
        b=i/10%10;
        c=i%10;
        sum=a*a*a+b*b*b+c*c*c;
        if(sum==i) {
             System.out.print(i+" ");
        }
        }
    }
}

2. The following graphic output in the console (knowledge: Loops, conditional statements)

import java.util.*;
public class C {
    public static void main(String[] args) {
          // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        for(int a=1;a<7;a++) {
            for(int b=1;b<=a;b++) {
                System.out.print(b);
            }
            System.out.println();
      }
    }
}

import java.util.*;
public class C {
    public static void main(String[] args) {
          // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        for(int a=1;a<7;a++) {
            for(int b=1;b<=7-a;b++) {
                System.out.print(b);
            }
            System.out.println();
      }
    }
}

import java.util.*;
public class C {
    public static void main(String[] args) {
          // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        for(int a=1;a<7;a++) {
            for(int b=a;b>0;b--) {
                System.out.print(b);
            }
            System.out.println();
      }
    }
}

import java.util.*;
public class C {
    public static void main(String[] args) {
          // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        for(int a=6;a>0;a--) {
            for(int b=0;b<6-a;b++) {
                System.out.print(" ");
            }
            for(int i=1;i<=a;i++) {
                System.out.print(i);
            }
            System.out.println("");
        }
    }
}

3. Enter the date, to determine which is the first day of the year (knowledge points: Loops, conditional statements)

import java.util.*;
public class C {
    public static void main(String[] args) {
          // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        int day=0;
        int month=0;
        int year=0;
        int sum=0;
        int leap;
        System.out.println("请输入年，月，日");
        Scanner intput=new Scanner(System.in);
        year= Input.nextInt (); 
        month The = input.nextInt (); 
        Day = input.nextInt ();
         Switch (month The)    / * First calculate the total number of days before a month month * / 
        { 
        Case . 1 : 
            SUM = 0; BREAK ;
         Case 2 : 
            SUM = 31 is; 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 The> 2 ) 
        { 
            SUM ++ ; 
            System.out.println (year + "of" + month + "month" + day + "number is the year of the first" + sum + "days." ); 
        } the else { 
            System.out.println (year + "of" + month + "month" + day + "number is the year of the first" + sum + "days." ); 
                } 
            } 
        } 
    }

4 . An input from the console . 4 bit integer after the number of inversions required, such as the original number 1234 , the number of bits after inversion 4321 (knowledge: loop statements, conditional statements)

import java.util.*;
public class C {
    public static void main(String[] args) {
          // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        int a, b, c, d, Y, x;
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入数字：");
        Y = sc.nextInt();
        a = Y / 1000;
        b = Y / 100 % 10;
        c = Y / 10 % 10;
        D = 10% the Y ; 
        X = C * D * 1000 + 100 + 10 * B + A; 
        System.out.println ( "inverted after number:" + X); 
        } 
    }