Chapter 6 Programs 1

package com.suarez;

import java.util.Scanner;

/*
Ryan Saqueton
Looks for @  in an email address
 */
public class Q62 {
    public static void main(String[] args){
    String email;
    Scanner scan = new Scanner(System.in);
        System.out.println("What is your email address?");
        email = scan.next();

        if (email.contains("@")) {
        System.out.println("Email address is valid");
    } else {
        System.out.println("Email address is invalid");
    }
}

package com.suarez;

import java.util.*;
/*
Ryan Saqueton
Converts decimal to binary
 */
public class Q64 {
    public static void main(String[] args) {
        int n, count = 0, a;
        String x = "";
        Scanner s = new Scanner(System.in);
        System.out.println("Enter any decimal number:");
        n = s.nextInt();
        while (n > 0) {
            a = n % 2;
            if (a == 1) {
                count++;
            }
            x = x + "" + a;
            n = n / 2;
        }
        System.out.println("Binary number:" + x);
    }
}

package com.company;

import java.util.Scanner;


/*
Ryan Saqueton
Uses XOR to determine true or false
 */
public class Q66 {
        public static void main(String[] args) {

            System.out.println("Input a binary number.");
            Scanner input = new Scanner(System.in);

            String URL = input.nextLine();
            int x = 0;
            int y = 0;

            while(URL.indexOf("1") != -1){
                URL = URL.replaceFirst("1","_");
                y = y+1;
            }

            while(URL.indexOf("0") != -1){
                URL = URL.replaceFirst("0","_");
                x = x+1;
            }

            if(x==y)
            {
                System.out.print("0 , False");
            }
            else
            {
                System.out.print("1 , True");
            }
        }
    }

package com.suarez;

import java.util.Scanner;

package com.suarez;

import java.util.Scanner;

/*
Ryan Saqueton
Sees if HTML is Valid
 */
public class Q68 {
    public static void main(String[] args){
        String HTML;
        char a = '<';
        char b = '>';
        Scanner scan = new Scanner(System.in);
        System.out.println("Enter your HTML");
        HTML = scan.next();
        int length = HTML.length();
        char first = HTML.charAt(0);
        char last = HTML.charAt(length-1);
        if (first == a && last == b) {
            System.out.println("HTML is valid");
        } else {
            System.out.println("HTML is invalid");
        }
    }
}