Building a Flutter Employee Salary Calculator App

Flutter Employee Salary Management System

This example demonstrates how to create a simple Flutter application to manage employee data and calculate gross salary based on specific criteria.

1. Core Data Model

import 'package:flutter/material.dart';

void main() { runApp(MyApp()); }

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(home: EmployeeEntryScreen());
  }
}

class Employee {
  String name, id, designation;
  double basicSalary;
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Computer Graphics: Essential Concepts and Techniques

Display Devices

Display devices are used to display graphical output generated by a computer.

1) CRT (Cathode Ray Tube)

  • Uses an electron beam to strike a phosphor screen.
  • The beam scans line by line to produce an image.
  • Used in old monitors and TVs.
  • Advantages: Good color quality.
  • Disadvantages: Heavy, bulky, high power consumption.

2) LCD (Liquid Crystal Display)

  • Uses liquid crystals to control light.
  • Requires a backlight.
  • Thin, lightweight, and consumes less power.
  • Used in laptops and mobile phones.

3) LED

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Data Communication and Networking Fundamentals

Fundamentals of Data Communication

Data communication is the exchange of data between devices through a transmission medium.

5 Core Components

  • Sender
  • Message
  • Transmission medium
  • Receiver
  • Protocol

Effective Communication Requirements

  • Delivery: Correct destination
  • Accuracy: No errors
  • Timeliness: On time

Telecommunication is communication over long distances. Data communication refers specifically to digital data exchange.

Transmission Media

Guided (Wired)

  • Twisted pair: Cheap, short distance, more noise
  • Coaxial: Better
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Additive Manufacturing Processes and Data Formats Explained

Laser Engineered Net Shaping (LENS)

Laser Engineered Net Shaping (LENS) is a powder-based Additive Manufacturing process used for direct metal deposition. It operates using a high-power laser and metal powder feed system. In this process, a focused laser beam creates a molten pool on a metallic substrate. Simultaneously, metal powder is delivered through a nozzle into the melt pool. The injected powder melts instantly and solidifies upon cooling, forming a metallurgically bonded layer. The deposition

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Essential Java Design Patterns Implementation

Composite Pattern

interface AComponent { int size(); }


public class File implements AComponent { private String name; private int size; public File(String name, int size) { super(); this.name = name; this.size = size; } public int size() { return size; } }


public class Directory implements AComponent { private List<AComponent> children; public Directory(String name) { children = new LinkedList<>(); } public int size() { int result = 0; for (AComponent child : children) result = result +

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Java Singly Linked List Implementation

A Singly Linked List is a fundamental data structure consisting of nodes where each node contains data and a reference to the next node.

Defining the Node Class

The Node class is the building block of the list, containing the data and the pointer to the next element.

class Node {
    private String data;
    private Node next;

    public Node(String data) {
        this.data = data;
    }

    public void setData(String data) {
        this.data = data;
    }

    public void setNext(Node node) {
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