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‎Amicable_Number.java

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import java.util.*;
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class Amicable_Number
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{
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public static void main(String Args[])
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{
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Scanner sc=new Scanner(System.in);
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System.out.println("Enter a two numbers");
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int n1=sc.nextInt();
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int n2=sc.nextInt();
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int i,s1=0,s2=0;
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for(i=1;i<=n1;i++)
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{
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if(n1%i==0 || n1%i==n1)
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s1=s1+i;
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}
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for(i=1;i<=n2;i++)
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{
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if(n2%i==0 || n2%i==n2)
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s2=s2+i;
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}
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if(s1==n2 && s2==n1)
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System.out.println("Amicable Number");
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else
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System.out.println("Not an Amicable Number");
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}
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}

‎Armstrong_No.java

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import java.util.*;
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class Armstrong_No
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{
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public static void main(String args[])
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{
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Scanner sc=new Scanner(System.in);
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System.out.println("Enter a number");
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int n=sc.nextInt();
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int copy=n,s=0;
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while(n!=0)
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{
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int d=n%10;
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s=s+(d*d*d);
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n=n/10;
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}
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if(copy==s)
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System.out.println("Armstrong Number");
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else
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System.out.println("Not an Armstrong Number");
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}
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}

‎Automorphic_No.java

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import java.util.Scanner;
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public class Automorphic_No
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{
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public static void main(String args[])
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{
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Scanner sc = new Scanner(System.in);
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System.out.print("Input a number : ");
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int num = sc.nextInt();
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int sq_num = num*num;
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String str_num = Integer.toString(num);
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String square = Integer.toString(sq_num);
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if(square.endsWith(str_num))
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System.out.println("Automorphic Number.");
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else
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System.out.println("Not an Automorphic Number.");
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}
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}

‎Bouncy_23.java

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import java.io.*;
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class Bouncy_23
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{
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public static void main(String args[])throws IOException{
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BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
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System.out.print("N = ");
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int n = Integer.parseInt(br.readLine());
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if(n < 0){
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System.out.println("Not an increasing number.");
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System.out.println("Not a decreasing number.");
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System.out.println("Not a bouncy number.");
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return;
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}
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if(isIncreasing(n))
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System.out.println(n + " is an increasing number.");
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if(isDecreasing(n))
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System.out.println(n + " is a decreasing number.");
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if(!isIncreasing(n) && !isDecreasing(n))
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System.out.println(n + " is a bouncy number.");
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}
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public static boolean isIncreasing(int num){
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int last = num % 10;
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boolean status = true;
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while(num != 0){
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int digit = num % 10;
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if(digit > last){
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status = false;
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break;
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}
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last = digit;
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num /= 10;
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}
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return status;
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}
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public static boolean isDecreasing(int num){
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int last = num % 10;
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boolean status = true;
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while(num != 0){
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int digit = num % 10;
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if(digit < last){
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status = false;
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break;
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}
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last = digit;
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num /= 10;
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}
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return status;
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}
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}

‎Buzz_No.java

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import java.util.*;
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class Buzz_No
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{
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public static void main(String args[])
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{
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Scanner sc=new Scanner(System.in);
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System.out.println("Enter a number");
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int n=sc.nextInt();
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if(n%10==7 || n%7==0)
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System.out.println("Buzz Number");
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else
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System.out.println("Not a Buzz Number");
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}
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}

‎Composite_No.java

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import java.util.*;
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class Composite_No
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{
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public static void main(String args[])
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{
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Scanner sc=new Scanner(System.in);
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System.out.println("Enter a number");
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int n=sc.nextInt();
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int i,c=0;
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for(i=1;i<=n;i++)
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{
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if(n%i==0)
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c++;
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}
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if (c>2)
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System.out.println("Composite Number");
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else
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System.out.println("Not a Composite Number");
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}
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}
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‎Convert.java

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import java.util.*;
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class Convert
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{
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static int n,b,oct;
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static int a[],a2[];
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Convert(int nn)
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{
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n=nn;
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a=new int[n];
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a2=new int[n];
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b=0;
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oct=0;
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}
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void bin()
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{
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int x=n;
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while(x>0)
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{
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a[b++]=x%2;
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x=x/2;
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}
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}
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void oct()
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{
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int x=n;
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while(x>0)
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{
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a2[oct++]=x%8;
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x=x/8;
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}
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}
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public static void main()
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{
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Scanner sc= new Scanner(System.in);
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System.out.print("Enter number ");
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int num=sc.nextInt();
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Convert ob=new Convert(num);
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ob.bin();
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ob.oct();
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System.out.print("Binary Number : ");
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for(int i=b-1;i>=0;i--)
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System.out.print(a[i]);
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System.out.print("\nOctal Number : ");
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for(int i=oct-1;i>=0;i--)
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System.out.print(a2[i]);
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}
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}

‎Disarium_No.java

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import java.util.*;
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public class Disarium_No
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{
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public static void main(String args[])
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{
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Scanner sc = new Scanner(System.in);
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System.out.print("Input a number : ");
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int num = sc.nextInt();
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int copy = num, d = 0, sum = 0;
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String s = Integer.toString(num);
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int len = s.length();
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while(copy>0)
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{
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d = copy % 10;
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sum = sum + (int)Math.pow(d,len);
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len--;
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copy = copy / 10;
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}
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if(sum == num)
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System.out.println("Disarium Number.");
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else
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System.out.println("Not a Disarium Number.");
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}
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}

‎Duck_No.java

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import java.util.*;
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class Duck_No
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{
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// Function to check whether
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// the given number is duck number or not.
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static boolean check_duck(String num)
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{
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// Ignore leading 0s
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int i = 0, n = num.length();
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while (i < n && num.charAt(i) == '0')
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i++;
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// Check remaining digits
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while (i < n) {
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if (num.charAt(i) == '0')
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return true;
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i++;
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}
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return false;
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}
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// Driver Method
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public static void main(String args[])
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{
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String num = "1023";
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if (check_duck(num))
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System.out.println("It is a duck number");
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else
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System.out.println("It is not a duck number");
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}
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}

‎Emrip_No_21.java

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import java.util.*;
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class Emrip_No_21
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{
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public static void main(String args[])
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{
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Scanner sc=new Scanner(System.in);
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System.out.println("Enter a number");
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int n=sc.nextInt();
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int i,c=0,e=0,copy=n,s=0;
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for(i=1;i<=n;i++)
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{
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if(n%i==0)
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c++;
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}
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while(copy!=0)
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{
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int d=copy%10;
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s=((s*10)+d);
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copy=copy/10;
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}
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for(i=1;i<=s;i++)
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{
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if(s%i==0)
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e++;
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}
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if(c==2 && e==2)
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System.out.println("Emrip No");
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else
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System.out.println("Not an Emrip No");
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}
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}

‎Even_or_Odd_3.java

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import java.util.*;
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// A simple Java program
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// to check for even or odd
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class Even_or_Odd_3
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{
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// Returns true if n
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// is even, else odd
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static boolean isEven(int n)
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{
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// Return true if
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// n/2 does not result
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// in a float value.
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return ((n / 2) * 2 == n);
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}
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// Driver code
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public static void main(String[] args)
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{
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Scanner sc=new Scanner(System.in);
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System.out.println("Enter a number");
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int n =sc.nextInt();
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if(isEven(n) != false)
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System.out.print( "Even" );
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else
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System.out.print( "Odd" );
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}
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}

‎Fibonacci_6_2nd_type.java

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import java.util.*;
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class Fibonacci_6_2nd_type
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{
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public static void main(String args[])
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{
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Scanner sc=new Scanner(System.in);
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System.out.println("Enter limit number");
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int n=sc.nextInt();
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int a=0,b=1,c=0,i;
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for(i=0;i<=n;i++)
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{
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System.out.println(a+" ,");
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a=a+b;
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b=a-b;
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}
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}
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}

‎Fibonacci_No.java

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import java.util.*;
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class Fibonacci_No
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{
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public static void main(String args[])
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{
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Scanner sc=new Scanner(System.in);
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System.out.println("Enter limit number");
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int n=sc.nextInt();
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int a=0,b=1,c=0,i;
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for(i=0;i<=n;i++)
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{
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c=a+b;
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System.out.println(a+" ,");
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a=b;
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b=c;
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}
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}
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}

‎HCF_LCM_17.java

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import java.util.*;
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class HCF_LCM_17
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{
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public static void main(String args[])
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{
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Scanner sc=new Scanner(System.in);
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System.out.println("enter two numbers ");
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int a=sc.nextInt();
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int b=sc.nextInt();
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int min=Math.min(a,b);
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int h=0;
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for(int i=1;i<=min;i++)
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{
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if(a%i==0 && b%i==0)
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h=i;
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}
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double l=(a*b)/h;
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System.out.println("HCF= "+h);
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System.out.println("LCM= "+l);
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}
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}

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