Se establece un intervalo de x de -20 a 20 para hallar los f(x) que cambian de signo, X aumenta en 1.
Se halla el cambio de signo de f(x) en los intervalos -1 a 0 y 1 a 2, como muestra la fig de arriba.
Se establece un intervalo de x de -20 a 20 para hallar los f(x) que cambian de signo, X aumenta en 1.
Se halla el cambio de signo de f(x) en los intervalos -1 a 0 y 1 a 2, como muestra la fig de arriba.
import javax.swing.JOptionPane;
import javax.swing.table.DefaultTableModel;
public class frmListar extends javax.swing.JFrame {
coneBD cn=new coneBD();
DefaultTableModel modelo=new DefaultTableModel();
public frmListar() {
initComponents();
String titu[]={"IDCliente","Nombres","Apellidos","Direccion","Telefono","E-mail"};
modelo.setColumnIdentifiers(titu);
tblClientes.setModel(modelo);
}
private void llenarT() {
String SQL="select * from clientes;";
String datos[]=new String[6];
try{
cn.Conectar();
cn.st=cn.conec.createStatement();
cn.rt=cn.st.executeQuery(SQL);
while (cn.rt.next()){
datos[0]=cn.rt.getString(1);
datos[1]=cn.rt.getString(2);
datos[2]=cn.rt.getString(3);
datos[3]=cn.rt.getString(4);
datos[4]=cn.rt.getString(5);
datos[5]=cn.rt.getString(6);
modelo.addRow(datos);
}
}catch(Exception e){
JOptionPane.showMessageDialog(null, e.toString());
}
private void btnListarActionPerformed(java.awt.event.ActionEvent evt) {
llenarT();
}
}
Clase de Coneccion a base de datos, coneBD.java
import java.sql.*;
import javax.swing.JOptionPane;
public class coneBD {
public static PreparedStatement prest=null;
public static CallableStatement cllst=null;
public static Connection conec=null;
public static Statement st=null;
public static ResultSet rt=null;
public static String usu;
public static String contra;
public static String host;
public static String db;
public void Conectar(){
try{
usu="root"; contra=""; host="localhost"; db="ventas";
String url="jdbc:mysql://"+host+"/"+db;
Class.forName("com.mysql.jdbc.Driver").newInstance();
conec=DriverManager.getConnection(url,usu,contra);
}catch(Exception e){
JOptionPane.showMessageDialog(null, e.toString());
}
}
}
Entrar a geogebra.org
Public Class frmGrid3
Dim Aplicacion As Excel.Application
Dim Libro As Excel.Workbook
Dim hoja As Excel.Worksheet
Private Sub frmGrid3_Load(sender As Object, e As EventArgs) Handles MyBase.Load
cargarLibro()
End Sub
Private Sub cargarLibro()
DataGridView1.ColumnCount = 3
DataGridView1.Columns(0).Name = "Bar Code"
DataGridView1.Columns(1).Name = "Producto"
DataGridView1.Columns(2).Name = "Precio"
DataGridView1.Columns(1).Width = 200
Aplicacion = New Excel.Application
Libro = Aplicacion.Workbooks.Open("C:\Users\miky mouse\OneDrive\ejemplo5.xlsx")
hoja = Libro.Worksheets(2)
End Sub
Private Sub frmGrid3_Closed(sender As Object, e As EventArgs) Handles MyBase.Closed
Libro.Close()
Aplicacion.Quit()
End Sub
Private Sub TextBox1_KeyDown(sender As Object, e As KeyEventArgs) Handles TextBox1.KeyDown
Dim bc As String
Dim dato(3) As String
If e.KeyCode = 13 Then
bc = TextBox1.Text
For i = 2 To 23
If bc = hoja.Cells(i, 1).Value Then
dato(0) = hoja.Cells(i, 1).value
dato(1) = hoja.Cells(i, 2).value
dato(2) = hoja.Cells(i, 3).value
DataGridView1.Rows.Add(dato)
End If
Next
MsgBox("enter " + bc)
End If
End Sub
End Class
Imports Microsoft.Office.Interop.Excel
Private Sub LeerExcel()
Dim Aplicacion As Excel.Application
Dim Libro As Excel.Workbook
Dim hoja As Excel.Worksheet
Dim cad As String
Aplicacion = New Excel.Application
Libro = Aplicacion.Workbooks.Open("C:\Users\miky mouse\OneDrive\ejemplo3.xlsx")
hoja = Libro.Worksheets(1)
cad = hoja.Cells(3, 5).Value ' Lee de hoja 1 fila 3 y columna5
MsgBox("dato=" + cad)
hoja.Cells(8, 1).value = "9876.65" 'Agrega en hoja 1 el dato, en fila 8 y columna 1
Libro.Close()
Aplicacion.Quit()
End Sub
Public Class frmGrid
Private Sub frmGrid_Load(sender As Object, e As EventArgs) Handles MyBase.Load
carga()
End Sub
Private Sub carga()
DataGridView1.ColumnCount = 4
DataGridView1.Columns(0).Name = "Marca"
DataGridView1.Columns(1).Name = "Modelo"
DataGridView1.Columns(2).Name = "Year"
DataGridView1.Columns(3).Name = "MSRP"
Dim dato(4) As String
dato(0) = "Toyota"
dato(1) = "Prius"
dato(2) = "2020"
dato(3) = "18000"
DataGridView1.Rows.Add(dato)
dato(0) = "Toyota"
dato(1) = "RAV 4"
dato(2) = "2019"
dato(3) = "19000"
DataGridView1.Rows.Add(dato)
dato(0) = "Toyota"
dato(1) = "HighLander"
dato(2) = "2018"
dato(3) = "19555"
DataGridView1.Rows.Add(dato)
dato(0) = "Dodge"
dato(1) = "Charger"
dato(2) = "2017"
dato(3) = "18555"
DataGridView1.Rows.Add(dato)
End Sub
Private Sub btnObtener_Click(sender As Object, e As EventArgs) Handles btnObtener.Click
txtPrecio.Text = DataGridView1.Item(3, 2).Value
End Sub
Private Sub btnFila_Click(sender As Object, e As EventArgs) Handles btnFila.Click
Dim cad As String
cad = DataGridView1.SelectedRows(0).Cells(0).Value + DataGridView1.SelectedRows(0).Cells(1).Value
cad += DataGridView1.SelectedRows(0).Cells(2).Value + DataGridView1.SelectedRows(0).Cells(3).Value
txtPrecio.Text = cad
End Sub
Private Sub btnEliminar_Click(sender As Object, e As EventArgs) Handles btnEliminar.Click
DataGridView1.Rows.RemoveAt(2)
End Sub
End Class
Se establece un intervalo de x de -20 a 20 para hallar los f(x) que cambian de signo, X aumenta en 1. Se halla el cambio de signo de f(x...