e.1

package ch6;

public class E1a {

        public static void main(String[] args) {
        int sum = 0;
        for(int i=2; i <= 100; i = i +2){
                sum = sum + i;

                }
        System.out.print(sum);

        }
}

package ch6;

public class E1b {

        public static void main(String[] args) {
                int n = 1;
                int square;
                int sum = 0;
                while (n <= 10) {
                    square= (n*n);
                    sum += square;
                    n++;
                        }
                System.out.println(sum);
                }
}

package ch6;

public class E1c {

        public static void main(String[] args) {
                for(int i=1; i <= 20; i++){
                        System.out.print(Math.pow(2, i) + " ");
                }
        }

package ch6;
import java.util.Scanner;
public class E1d {

        public static void main(String[] args) {
                Scanner scan = new Scanner(System.in);
                int sumOdds=0;
                int a;
                int b;
                System.out.println("lower value");
                a = scan.nextInt();
                System.out.println("upper value");
                b = scan.nextInt();

                if(a % 2==0)
                {
                        a++;
                }
                if( b % 2 ==0)
                {
                        b--;
                }
                for(int j=a; j>=a && j<=b; j+=2)
                {
                        sumOdds = sumOdds + j;

                }
                System.out.println(sumOdds);

        }

}

package ch6;

public class E1e {

        public static void main(String[] args) {
                int sum= 0;
                int digit=0;
                int number= 123456789;
                while ( number > 0 )
                {
                    digit=number % 10;
                    if ( digit %2 == 1 )
                    {
                        sum+=digit;
                    }
                    number/=10;
                }
                System.out.println(sum);
        }


}