Java – Prime and Perfect Numbers – Ameerpet Technologies

Program to check the input number is Prime or Not

import java.util.Scanner;
class Code
{
            public static void main(String[] args)
            {
                        Scanner sc = new Scanner(System.in);
                        System.out.print(“Enter n value : “);
                        int n = sc.nextInt();
                        int count=0;
                        for (int i=1 ; i<=n ; i++)
                        {
                                    if(n%i==0)
                                                count++;
                        }
                        if(count==2)
                                    System.out.println(“Prime Number”);
                        else
                                    System.out.println(“Not a Prime Number”);
            }
}

Program to check the input number is Perfect or Not

import java.util.Scanner;
class Code
{
            public static void main(String[] args)
            {
                        Scanner sc = new Scanner(System.in);
                        System.out.print(“Enter n value : “);
                        int n = sc.nextInt();
                        int sum=0;
                        for (int i=1 ; i<n ; i++)
                        {
                                    if(n%i==0)
                                    {
                                                sum=sum+i;
                                    }
                        }
                        if(n==sum)
                                    System.out.println(“Perfect Number”);
                        else
                                    System.out.println(“Not a Perfect Number”);
            }
}

Program to print Fibonacci series

import java.util.Scanner;
class Code
{
            public static void main(String[] args)
            {
                        Scanner sc = new Scanner(System.in);
                        System.out.print(“Enter number of factors in series : “);
                        int n = sc.nextInt();
                        int a=0, b=1, c;
                        for (int i=1 ; i<=n ; i++)
                        {
                                    System.out.print(a + ” “);
                                    c=a+b;
                                    a=b;
                                    b=c;
                        }
            }
}

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