HTML Form Examples and Server-Side Processing
Web Development Examples
Euro to Peseta Converter Example (PHP)
This example demonstrates a simple server-side process using PHP to convert Euros to Spanish Pesetas. It shows how a value submitted from a form could be processed on the server.
Note: The original code snippet contained a syntax error (`$REQUEST`). The corrected logic would typically use `$_REQUEST`, `$_GET`, or `$_POST` depending on the form method.
<?php
// Assuming the form method is POST and the input name is 'cantidad'
$cantidad_SQL Queries: Examples and Explanations
Here are some SQL query examples to help you perform common database tasks:
Selecting Data
Display jobs with a minimum salary greater than 10000
SELECT * FROM JOBS WHERE MIN_SALARY > 10000Display the first name and hire date of employees who joined between 2002 and 2005
SELECT FIRST_NAME, HIRE_DATE FROM EMPLOYEES WHERE TO_CHAR(HIRE_DATE, 'YYYY') BETWEEN 2002 AND 2005 ORDER BY HIRE_DATEDisplay the first name and hire date of employees who are either IT Programmers or Sales Managers
SELECT FIRST_NAME,
Pascal Program: Math & Geometry Calculations Menu
PROGRAM MenuFunctionsOrProcedures;
USES crt;
VAR
B, X, R, Y: INTEGER;
Functions
FUNCTION Sum (N: INTEGER): INTEGER;
VAR
I, S: INTEGER;
BEGIN
S := 0;
FOR I := 1 TO N DO
BEGIN
S := S + I;
END;
Sum := S;
END;FUNCTION Factorial (N: INTEGER): INTEGER;
VAR
I, F: INTEGER;
BEGIN
F := 1;
IF N >= 0 THEN
BEGIN
FOR I := 1 TO N DO
BEGIN
F := F * I;
END;
END
ELSE
BEGIN
F := 0; // Factorial is not defined for negative numbers
END;
Factorial := F;
END;FUNCTION Power (Base, Exponent: INTEGER): INTEGER;
VAR
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Book Acknowledgements: Contributors and Image Sources
Acknowledgements
Contributors and Collaborators
The authors would like to thank everyone who has helped in the creation of this book:
- José Vicente Gargallo (Computing Engineer)
- Xavier Amorós (Telecommunications Engineer)
- Vicente Puchol (Agricultural Engineer and employee at Isagri)
- Daniel de las Heras (Graphic Designer)
- Ted McAleer (Voiceover Actor)
- Andy Boyns (Voiceover Actor)
- Jenn Henry (Voiceover Actress)
Image and Icon Sources
We would like to thank the following websites for the permission to reproduce
Trigonometry: Functions, Laws, and Applications
Trigonometric Functions
Even Functions: cos(-t) = cos(t), sec(-t) = sec(t)
Odd Functions: sin(-t) = -sin(t), tan(-t) = -tan(t), csc(-t) = -csc(t), cot(-t) = -cot(t)
Example: A point P(x, y) is shown on the unit circle corresponding to a real number t. Find the values of the trigonometric functions at t.
A) P(-15/17, 8/17):
- sin(t) = 8/17
- cos(t) = -15/17
- tan(t) = -8/15
- csc(t) = 17/8
- sec(t) = -17/15
- cot(t) = -15/8
Graphs of Trigonometric Functions
Amplitude, Period, and Phase Shift:
y = Asin(Bx):
- |A|: Amplitude
RMI Elevator System: Server-Side Code Analysis
AscensorRMI: Server Package
This section details the AscensorRMI class, which extends UnicastRemoteObject and represents a remote elevator object.
package server;
import java.rmi.*;
import java.rmi.server.UnicastRemoteObject;
import interfaz.GestorAscensores;
public class AscensorRMI extends UnicastRemoteObject {
private static final long serialVersionUID = 1L;
Gate door;
private int floor;
private int state;
private int id;
int model;
public AscensorRMI(int num) throws