Java – For Loop Programs – Ameerpet Technologies

Find Sum of First N numbers

import java.util.Scanner;
class Code
{
            public static void main(String[] args)
            {
                        Scanner scan = new Scanner(System.in);
                        System.out.println(“Enter n value : “);
                        int n = scan.nextInt();
                        int sum=0;
                        for (int i=1 ; i<=n ; ++i)
                        {
                                    sum = sum+i;
                        }
                        System.out.println(“Sum of first ” + n + ” numbers is : ” + sum);
            }
}

Program to Find Factorial of Number

class Code
{
            public static void main(String[] args)
            {
                        Scanner scan = new Scanner(System.in);
                        System.out.println(“Enter n value : “);
                        int n = scan.nextInt();
                        int fact=1;
                        for (int i=1 ; i<=n ; ++i)
                        {
                                    fact = fact*i;
                        }
                        System.out.println(“Factorial of ” + n + ” is : ” + fact);
            }
}

Program to display Multiplication table

import java.util.Scanner;
class Code
{
            public static void main(String[] args)
            {
                        Scanner scan = new Scanner(System.in);
                        System.out.println(“Enter table number : “);
                        int n = scan.nextInt();
                        for (int i=1 ; i<=10 ; ++i)
                        {
                                    System.out.println(n + ” x ” + i + ” = ” + (n*i));
                        }
            }
}

Print Even Numbers from 1 to 10

class Code
{
            public static void main(String[] args)
            {
                        for (int i=1 ; i<=10 ; ++i)
                        {
                                    if(i%2==0)
                                    {
                                                System.out.println(i);
                                    }
                        }
            }
}

Find Sum of Even Numbers in Java

import java.util.Scanner;
class Code
{
            public static void main(String[] args)
            {
                        Scanner scan = new Scanner(System.in);
                        System.out.print(“Enter range : “);
                        int n = scan.nextInt();
                        int sum=0;
                        for (int i=1 ; i<=n ; i++)
                        {
                                    if(i%2==0)
                                                sum=sum+i;
                        }
                        System.out.println(“Even numbers sum : ” + sum);
            }
}

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