Imprimir los numeros del 1 al 20

Imprimir los numeros del 1 al 20

' Gambas class file

PUBLIC SUB _new()

END

PUBLIC SUB Form_Open()

END

PUBLIC SUB Button2_Click()

QUIT

END

PUBLIC SUB Button1_Click()

DIM a AS Integer

FOR a = 1 TO 20

ListBox1.Add(A)

NEXT

END

PUBLIC SUB Button3_Click()

ListBox1.Clear

END