ex 6.1

a.
package chapter5;

public class ex61a {
//int number = 2;
//int sum = 0;

	public static void main(String[] args) {
		int number = 2;
		int sum = 0;
		// TODO Auto-generated method stub
		while(number <= 100){
			sum = sum + number;
			number++;
			System.out.println("the sum is " + sum);
		}
		System.out.println("the sum is " + sum);
	}

}

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b.
package chapter5;

public class ex61b {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		int number = 1;
		int square = 1;
		int sum = 0;
		// TODO Auto-generated method stub
		while(square <= 100){
			square = number * number;
			sum = sum + square;
			number++;
			System.out.println("the sum is " + sum);
		}
		System.out.println("the sum is " + sum);
	}


	}

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c.
package chapter5;

public class ex61c {

	public static void main(String[] args) {
		int power = 0;
		//int square = 1;
		int sum = 0;
		// TODO Auto-generated method stub
		while(power <= 20){
			Math.pow(2, power);
			sum = sum + power;
			power++;
			//System.out.println("the sum is " + sum);
		}
		System.out.println("the sum is " + sum);
	}

	}

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d.
package chapter5;
import java.util.Scanner;
//package chapter5;

public class ex61d {

	public static void main(String[] args) {
		// TODO Auto-generated method stub

		Scanner aaa = new Scanner(System.in);

		Scanner bbb = new Scanner(System.in);
		System.out.println("a is...");
		int a= aaa.nextInt();
		System.out.println("b is...");
		int b = bbb.nextInt();
		int number = a;
		int sum = 0;
		while(number <=b)
		{
		if(number % 2 != 0)
		{
		sum = sum + number;
		}
		number++;
		System.out.println("the sum is " + sum);
		}

	}

}

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e.
package chapter5;

public class ex61e {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		String n = "1492";
		 String digit;
		 int SumOddDigits=0;
		for(int num =0; num <= n.length(); num++)
		{
			char letter = n.charAt(num);
		digit = Character.toString(letter);
		Integer.parseInt(digit);
		if(digit % 2 != 0) { SumOddDigits += digit;}
		}

	}

}