Chapter 6 Programs 2

package com.suarez;

import java.util.*;
import java.lang.*;
/*
Ryan Saqueton
Calculates your lowest, highest, and average grade
 */
public class Q61 {
    public static void main(String[] args)
    {
        Scanner input = new Scanner(System.in);
        int lowest = 100;
        int highest = 0;
        int average;
        int gradeTotal = 0;
        System.out.println("Enter ten grades");
        int grade = input.nextInt();
        int amount = 1;
        gradeTotal += grade;
        while(amount <= 10) {
            if (grade < 0 || grade > 100) {
                System.out.println("This grade is invalid");
                amount = 13;
            } else {
                if (grade < lowest) {
                    lowest = grade;
                }
                if (grade > highest) {
                    highest = grade;
                }
                if (amount != 10) {
                    System.out.println("Type another one of your grades");
                    grade = input.nextInt();


                    gradeTotal += grade;
                }
                amount++;
            }
        }
        average = gradeTotal/10;
        if(amount == 11) {
            System.out.println("Your lowest grade is" + lowest);
            System.out.println("Your highest grade is" + highest);
            System.out.println("Your average grade is " + average);
        }
    }
}

package com.suarez;

import java.util.*;

/*
Ryan Saqueton
User ID valid or Invalid
 */
public class Q63 {

    public static void main(String[] args) {
        String ID;
        int i = 2;
        Scanner scan = new Scanner(System.in);
        System.out.println("Enter your user ID");

        ID = scan.next();
            if (ID.length() = i) {
                System.out.println("User ID is valid");
            }
            else{
                System.out.println("User ID is invalid");
            }
        }
    }

package com.suarez;

import java.util.*;
/*
Ryan Saqueton
Converts binary to decimal
 */
public class Q65{

        public static void main(String args[])
        {
            Scanner scan=new Scanner(System.in);

            System.out.println("Enter a binary number:");
            int num=scan.nextInt();

            int answer=0,p=0;

            while(num!=0)
            {
                answer+=((num%10)*Math.pow(2,p));
                num=num/10;
                p++;
            }

            System.out.println(answer);
        }
    }

package com.suarez;

import java.util.*;
/*
Ryan Saqueton
Checks if a word is a palindrome
 */

public class Q67 {

    public static void main(String args[])
    {
        String original, backwards = "";
        Scanner scan = new Scanner(System.in);

        System.out.println("Enter a word");
        original = scan.nextLine();
        String originalActual = original.toLowerCase();

        int length = originalActual.length();

        for (int i = length - 1; i >= 0; i--)
            backwards = backwards + originalActual.charAt(i);

        if (originalActual.equals(backwards))
            System.out.println("The word is a palindrome");
        else
            System.out.println("The word isn't a palindrome");

    }
}