Notes, summaries, assignments, exams, and exercises for Computer science for Baccalaureate

Telephone Book Database Using Hash Table in C++

/*
Author - Shantanu Wable

Consider a telephone book database of N clients. Make use of a hash table implementation to quickly look up a client's telephone number. Make use of 2 collision handling techniques and compare them using the number of comparisons required to find a set of telephone numbers.
*/

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

class Client {

char name[20];
ll ph1;

public:

Client() {
strcpy(name, "----");
ph1 = 0;
}

void printDetails() {
cout.width(20);
cout << name << " ";
cout.width(20);
cout << ph1 << "\n";
}

Client(char n[], ll teleph1) {
strcpy(name, n);
...

painlessMesh and namedMesh Examples

The following two sketches demonstrate how to build a wireless mesh network with the painlessMesh library on ESP8266 and ESP32 boards.

Example 1: Broadcasting with painlessMesh

#include "painlessMesh.h"

#define MESH_PREFIX "whateverYouLike"

#define MESH_PASSWORD "somethingSneaky"

#define MESH_PORT 5555

Scheduler userScheduler;

painlessMesh mesh;

void sendMessage();

Task taskSendMessage(TASK_SECOND * 1, TASK_FOREVER, &sendMessage);

void sendMessage() {
  String msg = "Hello from node ";
  msg += mesh.getNodeId();
  mesh.sendBroadcast(msg);
  taskSendMessage.setInterval(random(TASK_SECOND * 1, TASK_SECOND * 5));
}

void receivedCallback(uint32_t from, String &msg) {
  Serial.printf("startHere: Received from...

Arduino Obstacle-Avoiding Robot Code

set pagesize 200
set linesize 200
Vraag 1:
ALTER TABLE afspraken MODIFY duur DEFAULT 30;
SAVEPOINT save_before;
INSERT INTO afspraken (datum, uur, pat) VALUES ('30-JAN-19', 14.15, 'p5');
INSERT INTO afspraken (datum, uur, pat) VALUES ('12-FEB-19', 9.10, 'p2');
INSERT INTO afspraken (datum, uur, pat) VALUES ('05-MAY-19', 13.30, 'p5');
ROLLBACK TO SAVEPOINT save_before;
COMMIT;
Vraag 2:
CREATE TABLE tarieven (code NUMBER(3) NOT NULL, bedrag NUMBER(4));
INSERT INTO tarieven VALUES (&code, &bedrag);
INSERT INTO tarieven VALUES (&code, &bedrag);
INSERT INTO tarieven VALUES (&code, &bedrag);
INSERT INTO tarieven VALUES (&code, &bedrag);
INSERT INTO tarieven VALUES (&code, &bedrag);
UPDATE behandelingen b
SET...

{

}

{

{

{

} } }

{

{

{

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

Librerías Estándar del Lenguaje C

A continuación se detallan las cabeceras principales de la biblioteca estándar de C (ANSI C) junto con sus funciones más representativas.

stdio.h: Entrada y Salida Estándar

La cabecera <stdio.h> provee capacidades esenciales para operaciones de entrada, salida y manejo de archivos.

• clearerr
• fclose
• feof
• ferror
• fflush
• fgetc
• fgetpos
• fgets
• fopen
• formato
• fprintf
• fputc
• fputs
• fread
• freopen
• fscanf
• fseek
• fsetpos
• ftell
• fwrite
• getc
• getchar
• gets
• perror
• printf
• putc
• putchar
• puts
• remove
• rename
• rewind
• scanf
• setbuf
• setvbuf
• sprintf
• sscanf
• tmpfile
• tmpnam
• ungetc
• vfprintf
• vprintf
• vsprintf

stdlib.h: Utilidades Generales y Memoria

La librería <stdlib.h> contiene funciones para gestión dinámica de memoria, control de procesos y conversiones numéricas.

• abort
• abs
• atexit
• atof
• atoi
• atol
• bsearch
• calloc
• div
• exit
• free
• getenv
• labs
• ldiv
• malloc
• mblen
• mbstowcs
• mbtowc
• qsort
• rand
• realloc
• srand
• strtod
• strtol
• strtoul
• system
• wctomb

string.

Exercício - Banco

Classe abstrata ContaBancaria

package ExercicioHeranca;

import java.util.Scanner;

public abstract class ContaBancaria {

protected int senha;

protected int numero;

protected double saldo;

public ContaBancaria(int senha) {

this.senha = senha;

}

public abstract void saca(double valor);

public abstract void deposita(double valor);

public abstract double tiraExtrato();

public void alteraSenha(int senha_nova) {

Scanner in = new Scanner(System.in);

System.out.println("Entre a senha atual: ");

int senha_digitada = in.nextInt();

if (senha_digitada == this.senha) {

this.senha = senha_nova;

System.out.println("Senha trocada");

} else {

...

Calculadora de Edad en Java con AWT

Este programa en Java utiliza la biblioteca AWT para crear una ventana que permite ingresar una fecha de nacimiento y calcular la edad.

Código fuente

import java.awt.event.*;
import java.util.*;

public class Awtedades {
    static Frame ventana = new Frame();
    static Label label1 = new Label("Digite su fecha de nacimiento: ");
    static Label label11 = new Label("");
    static Label label2 = new Label("Año:");
    static TextField txtanio = new TextField(12);
    static Label label3 = new Label("Mes:");
    static TextField txtmes = new TextField(12);
    static Label label4 = new Label("Día:");
    static TextField txtdia = new TextField(12);
    static Button btncalcular = new Button("Calcular");