Notes, summaries, assignments, exams, and problems for Computers

Java Membership Dues Calculator Example

Below is a corrected and formatted Java example that demonstrates conditionals, a switch, and loops. All original content has been preserved and corrected for spelling, grammar, and capitalization.

import java.util.Scanner;

public class DuesCalculator {
    public static void main(String[] args) {
        // TODO: application logic here
        // 1
        char standing;
        double gpa = 0, dues = 0;
        // 2
        Scanner keyboard = new Scanner(System.in); // import java.util.Scanner

        System.out.print("Enter your class standing: ");
        standing = keyboard.nextLine().charAt(0);

        System.out.println("Enter your GPA:");
        gpa = keyboard.nextDouble();

        // System.

WEEK 1: Software that Manages Computer Hardware

Operating System as an Abstract Machine, Service Provider, and Resource Manager. OS Objectives: Convenience, Efficiency, and Ability to Evolve.

Performance Indices

Arrival Time, Service Time, Turnaround Time, Normalized Turnaround Time. First-Come-First-Served (FCFS) Scheduling Policy.

Microprocessor and DMA Activity

Impact of Microprocessor Bus Configuration and DMA Activity on System Speed.

Memory System and Cache

Cache and Main Memory Access Time, Average Access Time Calculation.

iOS and Android

Similarities and Differences between iOS and Android.

Job Execution and CPU Utilization

CPU Utilization for Uniprogramming and Multiprogramming.

Direct Memory Access (DMA)

Coordination, Memory Operations Completion,... Continue reading "Understanding Operating Systems: Functions, Performance, and Multithreading" »

Computer Fundamentals and Data

A Computer is a programmable electronic device that can store, retrieve, and process data.

Data and Instructions: Instructions that manipulate data are logically the same as the data itself and can be stored in the same memory location.

Understanding Machine Language

Machine Language is a language made up of binary-coded instructions built directly into the computer's hardware and used by the processor.

Why Machine Language?

It is the fundamental language the hardware understands (no choice).

Characteristics of Machine Language

• Every processor has its own unique set of machine instructions.
• The relationship between the processor and the instructions it can carry out is completely integrated.
• Each machine-language instruction

Web Design & Development

Common Terms

Web Design

Is the act or practice of determining how a website looks.

Web Development

Is the act or practice of determining how a website works.

Navigation

Is the act of using and finding things on a website.

CSS

(Cascading Style Sheets) is a simple language that decides how a web page looks.

Coding

Is the programming language that makes up a website.

Visibility

Is how easily people find a website using search engines, based on how many other websites link to it.

Usability

Is how easy it is for a person to use a website.

Content

Is the material on a web page, including text and graphics.

Appearance

Is how a web page looks.

Functionality

Is the ability of different elements of a website to work together.

Programming Languages

C

Is... Continue reading "Web Design & Development Glossary: Terms and Definitions" »

Understanding Data, Processing, and System Components

1. Data Input and Storage

   Text, numbers, graphics, videos, and sounds entered into a computer's memory during input operations are referred to as ________.

   Data

2. Information Output

   Data that has been processed and converted into information is known as ________.

   Output

3. High-Capacity Computing Systems

   A ________ is a computer found in large businesses, organizations, and government agencies where thousands of users must simultaneously use the data and resources of their institution.

   Mainframe

4. Example of an Input Device

   A ________ is an example of an input device.

   Keyboard

5. Converting Physical to Digital Files

   A ________ is a device that converts documents or photos into digital files so they can be saved on

Chapter 3: Statelessness

This means that each request from a service consumer should contain all the necessary information for the service to understand the meaning of the request. All session state data should then be returned to the service consumer at the end of each request.

Figure 5.2. Statelessness ensures that each service consumer request can be treated independently by the service.

1. Cookies: Temporary data stored on the client-side, encrypted if SSL is used.

2. Types of Certificates:

• Site
• Personal
• Software Vendor
• Anonymous

3. Identity: Used for:

• Authentication
• Accountability
• Identifying principle

4. Principal: A unique identity. Identity is used to identify the principal, which is a computer representation of an entity.

5. Goals of a Certificate Regarding Identity: To bind the correct identity to a distinguished name.

6. Malicious Logic: A set of instructions that cause a site's security policy to be violated.

7. Predictable Computer Usage Patterns: Yes, my usage is statistically predictable. I often work from home, so the patterns between work and home are similar. I check email, run the browser, run Visual Studio, NetBeans, a... Continue reading "Security Essentials: Certificates, Identity, and Access Control" »

To start a backend project.

- npm init

Then make a file with whatever entry point you named it as, for example, server.js

Once package.json is created:

• npm i <package>
• connect-mongo (store sessions in DB)
• dotenv (for config files, environment variables)
• express
• mongoose
• express-sessions (sessions and cookies)
• method-override (to use PUT, UPDATE, DELETE requests)
• moments (date formatting)
• morgan (logging)
• passport (authentication)

npm i -D <package>

• nodemon (Update every file change instantly without having to restart the server)
• cross-env (To update environment variables in script definition itself)

After installing the dependencies, edit the scripts in package.json

Instructions:

1. Refer to the files using a relative path.
2. Save all files, including the HTML file, before using this feature.

Value 1

Value 2

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