Pg 338 HW programs

62.
package com.Suarez;

/*
Xander Fermier
1/25/19
Checks if the entered email adress is valid
 */

import java.util.*;
import java.lang.*;
public class EmailAddressValidator {
    public static void main(String []args)
    {
        Scanner scan = new Scanner(System.in);
        System.out.println("Give me an email address to check");
        String input = scan.next();
        int inputLength = input.length();
        int atCheck = 0;
        for (int i = 0; i <= inputLength-1; i++)
        {
            char inputchar = input.charAt(i);
            String atSymbol = String.valueOf(inputchar);
            if (atSymbol == "@")
            {
                atCheck++;
            }
            atSymbol = "";
        }
        if (atCheck == 1)
        {
            System.out.println("The email address is valid.");
        }
        else
        {
            System.out.println("The email address is not valid.");
        }
    }
}
64.
package com.Suarez;

/*
Xander Fermier
1/25/19
covnerts the users. entered decimal value to binary
 */

import java.util.*;

public class UserDecimalToBinary {
    public static void main(String []args)
    {
        Scanner scan = new Scanner(System.in);
        System.out.println("Give me your number to convert.");
        String input = scan.next();
        System.out.println(Integer.parseInt(input, 2));
    }
}
66.
package com.Suarez;

/*
Xander fermier
1/25/19
this program simulates XOR
 */

import java.util.*;

public class XORSimulator {
    public static void main(String[]args)
    {
        Scanner scan = new Scanner(System.in);
        System.out.println("Give me a XOR to check");
        String input = scan.next();
        char first;
        char second;
        String truth = "10";
        String falseth = "11";
        String truth2 = "01";
        String falseth2 = "00";
        int inputLength = input.length();
        StringBuilder check= new StringBuilder();
        for (int i = 0; i <= inputLength; i+=2)
        {
            first = input.charAt(i);
            second = input.charAt(i+1);

            check.append(first);
            check.append(second);
        }
        if (check.equals(truth) || check.equals(truth2))
        {
            System.out.println("True");
        }
        else if( check.equals(falseth) || check.equals(falseth2))
        {
            System.out.println("False");
        }
        else
        {
            System.out.println("Invalid entry");
        }
    }
}
68.
package com.Suarez;

/*
xander Fermier
1/25/19
this program checks whether the entered HTML is valid based on whether or not it has the same amount of <>
 */

import java.util.*;

public class HTMLChecker {
    public static void main(String []args)
    {
        Scanner scan = new Scanner(System.in);
        System.out.println("Give me your line to check");
        String input = scan.nextLine();
        int inputLength = input.length()-1;
        int openBracket = 0;
        int closeBracket = 0;
        for (int i = 0; i <= inputLength; i++)
        {
            char inputChar = input.charAt(i);
            String bracket = String.valueOf(inputChar);
            if (bracket == "<")
            {
                openBracket++;
            }
            if (bracket == ">")
            {
                closeBracket++;
            }
            bracket = "";
        }
        if (openBracket == closeBracket)
        {
            System.out.println("Your HTML is valid.");
        }
        else
        {
            System.out.println("Your HTML is not valid.");
        }
    }
}