Más de uno nos hemos roto en algún momento de nuestra vida la cabeza por querer desarrollar una rutina que nos permita convertir números a letras, es por ello que decidí compartir con todos uds. el presente artículo.
Consiste en una aplicación desarrollada en VB.Net apoyada con un módulo que recibe como parametro el valor ingresado y lo convierte en letras dependiendo si es positivo o negativo.
A continuación lo detallo en forma más específica:
Public Class FrmNumeroaletra
Inherits System.Windows.Forms.Form
'****************************************
'Desarrollado por: Pedro Alex Taya Yactayo
'Email: alextaya@hotmail.com
'Web: http://www.guiasyclasificados.com
' http://mugcanete.groups.live.com
'****************************************
#Region " Código generado por el Diseñador de Windows Forms "
Public Sub New()
MyBase.New()
'El Diseñador de Windows Forms requiere esta llamada.
InitializeComponent()
'Agregar cualquier inicialización después de la llamada a InitializeComponent()
End Sub
'Form reemplaza a Dispose para limpiar la lista de componentes.
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()
End If
End If
MyBase.Dispose(disposing)
End Sub
'Requerido por el Diseñador de Windows Forms
Private components As System.ComponentModel.IContainer
'NOTA: el Diseñador de Windows Forms requiere el siguiente procedimiento
'Puede modificarse utilizando el Diseñador de Windows Forms.
'No lo modifique con el editor de código.
Friend WithEvents Label1 As System.Windows.Forms.Label
Friend WithEvents Label2 As System.Windows.Forms.Label
Friend WithEvents CmdConvertir As System.Windows.Forms.Button
Friend WithEvents TxtNumero As System.Windows.Forms.TextBox
Friend WithEvents TxtLetra As System.Windows.Forms.TextBox
Friend WithEvents Timer1 As System.Windows.Forms.Timer
Friend WithEvents credito As System.Windows.Forms.Label
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.components = New System.ComponentModel.Container
Dim resources As System.Resources.ResourceManager = New System.Resources.ResourceManager(GetType(FrmNumeroaletra))
Me.Label1 = New System.Windows.Forms.Label
Me.Label2 = New System.Windows.Forms.Label
Me.CmdConvertir = New System.Windows.Forms.Button
Me.TxtNumero = New System.Windows.Forms.TextBox
Me.TxtLetra = New System.Windows.Forms.TextBox
Me.credito = New System.Windows.Forms.Label
Me.Timer1 = New System.Windows.Forms.Timer(Me.components)
Me.SuspendLayout()
'
'Label1
'
Me.Label1.AutoSize = True
Me.Label1.Font = New System.Drawing.Font("Arial", 9.75!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
Me.Label1.ForeColor = System.Drawing.Color.Navy
Me.Label1.Location = New System.Drawing.Point(8, 8)
Me.Label1.Name = "Label1"
Me.Label1.Size = New System.Drawing.Size(38, 18)
Me.Label1.TabIndex = 3
Me.Label1.Text = "Valor"
'
'Label2
'
Me.Label2.AutoSize = True
Me.Label2.Font = New System.Drawing.Font("Arial", 9.75!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
Me.Label2.ForeColor = System.Drawing.Color.FromArgb(CType(64, Byte), CType(0, Byte), CType(0, Byte))
Me.Label2.Location = New System.Drawing.Point(8, 40)
Me.Label2.Name = "Label2"
Me.Label2.Size = New System.Drawing.Size(66, 18)
Me.Label2.TabIndex = 4
Me.Label2.Text = "En Letras"
'
'CmdConvertir
'
Me.CmdConvertir.BackColor = System.Drawing.Color.Navy
Me.CmdConvertir.Cursor = System.Windows.Forms.Cursors.Hand
Me.CmdConvertir.FlatStyle = System.Windows.Forms.FlatStyle.Flat
Me.CmdConvertir.ForeColor = System.Drawing.Color.White
Me.CmdConvertir.Location = New System.Drawing.Point(232, 8)
Me.CmdConvertir.Name = "CmdConvertir"
Me.CmdConvertir.TabIndex = 1
Me.CmdConvertir.Text = "&Convertir"
'
'TxtNumero
'
Me.TxtNumero.Location = New System.Drawing.Point(88, 8)
Me.TxtNumero.Name = "TxtNumero"
Me.TxtNumero.Size = New System.Drawing.Size(128, 20)
Me.TxtNumero.TabIndex = 0
Me.TxtNumero.Text = ""
'
'TxtLetra
'
Me.TxtLetra.Location = New System.Drawing.Point(88, 40)
Me.TxtLetra.Name = "TxtLetra"
Me.TxtLetra.ReadOnly = True
Me.TxtLetra.Size = New System.Drawing.Size(456, 20)
Me.TxtLetra.TabIndex = 2
Me.TxtLetra.Text = ""
'
'credito
'
Me.credito.Font = New System.Drawing.Font("Microsoft Sans Serif", 6.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
Me.credito.ForeColor = System.Drawing.Color.Green
Me.credito.Location = New System.Drawing.Point(312, 64)
Me.credito.Name = "credito"
Me.credito.Size = New System.Drawing.Size(232, 40)
Me.credito.TabIndex = 5
Me.credito.Text = "Desarrollado por: Pedro Alex Taya Yactayo alextaya@hotmail.com http:"//es.geociti" & _
"es.com/wiseman_alextaya"
Me.credito.TextAlign = System.Drawing.ContentAlignment.TopRight
'
'Timer1
'
Me.Timer1.Enabled = True
Me.Timer1.Interval = 500
'
'FrmNumeroaletra
'
Me.AcceptButton = Me.CmdConvertir
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(550, 100)
Me.Controls.Add(Me.credito)
Me.Controls.Add(Me.TxtLetra)
Me.Controls.Add(Me.TxtNumero)
Me.Controls.Add(Me.CmdConvertir)
Me.Controls.Add(Me.Label2)
Me.Controls.Add(Me.Label1)
Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.Fixed3D
Me.Icon = CType(resources.GetObject("$this.Icon"), System.Drawing.Icon)
Me.MaximizeBox = False
Me.Name = "FrmNumeroaletra"
Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
Me.Text = "Convertir Número a Letra"
Me.ResumeLayout(False)
End Sub
#End Region
Private Sub CmdConvertir_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CmdConvertir.Click
TxtLetra.Text = ""
If IsNumeric(TxtNumero.Text) Then
TxtLetra.Text = Letras(TxtNumero.Text)
Else
MessageBox.Show("Ingrese por favor números", "Aviso", MessageBoxButtons.OK, MessageBoxIcon.Information)
End If
TxtNumero.Focus()
TxtNumero.SelectionStart = 0
TxtNumero.SelectionLength = TxtNumero.ToString.Length
End Sub
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
Static cColor As String
If cColor = "" Then
credito.ForeColor = System.Drawing.Color.Blue
cColor = "a"
Else
credito.ForeColor = System.Drawing.Color.Green
cColor = ""
End If
End Sub
End Class
Luego tenemos que crear el siguiente Módulo:Module aletras
'****************************************
'Desarrollado por: Pedro Alex Taya Yactayo
'Email: alextaya@hotmail.com
'Web: http://es.geocities.com/wiseman_alextaya
' http://groups.msn.com/mugcanete
'****************************************
Public Function Letras(ByVal numero As String) As String
'********Declara variables de tipo cadena************
Dim palabras, entero, dec, flag As String
'********Declara variables de tipo entero***********
Dim num, x, y As Integer
flag = "N"
'**********Número Negativo***********
If Mid(numero, 1, 1) = "-" Then
numero = Mid(numero, 2, numero.ToString.Length - 1).ToString
palabras = "menos "
End If
'**********Si tiene ceros a la izquierda*************
For x = 1 To numero.ToString.Length
If Mid(numero, 1, 1) = "0" Then
numero = Trim(Mid(numero, 2, numero.ToString.Length).ToString)
If Trim(numero.ToString.Length) = 0 Then palabras = ""
Else
Exit For
End If
Next
'*********Dividir parte entera y decimal************
For y = 1 To Len(numero)
If Mid(numero, y, 1) = "." Then
flag = "S"
Else
If flag = "N" Then
entero = entero + Mid(numero, y, 1)
Else
dec = dec + Mid(numero, y, 1)
End If
End If
Next y
If Len(dec) = 1 Then dec = dec & "0"
'**********proceso de conversión***********
flag = "N"
If Val(numero) <= 999999999 Then
For y = Len(entero) To 1 Step -1
num = Len(entero) - (y - 1)
Select Case y
Case 3, 6, 9
'**********Asigna las palabras para las centenas***********
Select Case Mid(entero, num, 1)
Case "1"
If Mid(entero, num + 1, 1) = "0" And Mid(entero, num + 2, 1) = "0" Then
palabras = palabras & "cien "
Else
palabras = palabras & "ciento "
End If
Case "2"
palabras = palabras & "doscientos "
Case "3"
palabras = palabras & "trescientos "
Case "4"
palabras = palabras & "cuatrocientos "
Case "5"
palabras = palabras & "quinientos "
Case "6"
palabras = palabras & "seiscientos "
Case "7"
palabras = palabras & "setecientos "
Case "8"
palabras = palabras & "ochocientos "
Case "9"
palabras = palabras & "novecientos "
End Select
Case 2, 5, 8
'*********Asigna las palabras para las decenas************
Select Case Mid(entero, num, 1)
Case "1"
If Mid(entero, num + 1, 1) = "0" Then
flag = "S"
palabras = palabras & "diez "
End If
If Mid(entero, num + 1, 1) = "1" Then
flag = "S"
palabras = palabras & "once "
End If
If Mid(entero, num + 1, 1) = "2" Then
flag = "S"
palabras = palabras & "doce "
End If
If Mid(entero, num + 1, 1) = "3" Then
flag = "S"
palabras = palabras & "trece "
End If
If Mid(entero, num + 1, 1) = "4" Then
flag = "S"
palabras = palabras & "catorce "
End If
If Mid(entero, num + 1, 1) = "5" Then
flag = "S"
palabras = palabras & "quince "
End If
If Mid(entero, num + 1, 1) > "5" Then
flag = "N"
palabras = palabras & "dieci"
End If
Case "2"
If Mid(entero, num + 1, 1) = "0" Then
palabras = palabras & "veinte "
flag = "S"
Else
palabras = palabras & "veinti"
flag = "N"
End If
Case "3"
If Mid(entero, num + 1, 1) = "0" Then
palabras = palabras & "treinta "
flag = "S"
Else
palabras = palabras & "treinta y "
flag = "N"
End If
Case "4"
If Mid(entero, num + 1, 1) = "0" Then
palabras = palabras & "cuarenta "
flag = "S"
Else
palabras = palabras & "cuarenta y "
flag = "N"
End If
Case "5"
If Mid(entero, num + 1, 1) = "0" Then
palabras = palabras & "cincuenta "
flag = "S"
Else
palabras = palabras & "cincuenta y "
flag = "N"
End If
Case "6"
If Mid(entero, num + 1, 1) = "0" Then
palabras = palabras & "sesenta "
flag = "S"
Else
palabras = palabras & "sesenta y "
flag = "N"
End If
Case "7"
If Mid(entero, num + 1, 1) = "0" Then
palabras = palabras & "setenta "
flag = "S"
Else
palabras = palabras & "setenta y "
flag = "N"
End If
Case "8"
If Mid(entero, num + 1, 1) = "0" Then
palabras = palabras & "ochenta "
flag = "S"
Else
palabras = palabras & "ochenta y "
flag = "N"
End If
Case "9"
If Mid(entero, num + 1, 1) = "0" Then
palabras = palabras & "noventa "
flag = "S"
Else
palabras = palabras & "noventa y "
flag = "N"
End If
End Select
Case 1, 4, 7
'*********Asigna las palabras para las unidades*********
Select Case Mid(entero, num, 1)
Case "1"
If flag = "N" Then
If y = 1 Then
palabras = palabras & "uno "
Else
palabras = palabras & "un "
End If
End If
Case "2"
If flag = "N" Then palabras = palabras & "dos "
Case "3"
If flag = "N" Then palabras = palabras & "tres "
Case "4"
If flag = "N" Then palabras = palabras & "cuatro "
Case "5"
If flag = "N" Then palabras = palabras & "cinco "
Case "6"
If flag = "N" Then palabras = palabras & "seis "
Case "7"
If flag = "N" Then palabras = palabras & "siete "
Case "8"
If flag = "N" Then palabras = palabras & "ocho "
Case "9"
If flag = "N" Then palabras = palabras & "nueve "
End Select
End Select
'***********Asigna la palabra mil***************
If y = 4 Then
If Mid(entero, 6, 1) <> "0" Or Mid(entero, 5, 1) <> "0" Or Mid(entero, 4, 1) <> "0" Or _
(Mid(entero, 6, 1) = "0" And Mid(entero, 5, 1) = "0" And Mid(entero, 4, 1) = "0" And _
Len(entero) <= 6) Then palabras = palabras & "mil "
End If
'**********Asigna la palabra millón*************
If y = 7 Then
If Len(entero) = 7 And Mid(entero, 1, 1) = "1" Then
palabras = palabras & "millón "
Else
palabras = palabras & "millones "
End If
End If
Next y
'**********Une la parte entera y la parte decimal*************
If dec <> "" Then
Letras = palabras & "con " & dec
Else
Letras = palabras
End If
Else
Letras = ""
End If
End Function
End Module
Espero les sirva de algo esta rutina.
Hasta la próxima oportunidad.....:=)
Jordi Fernández
