The document describes the code for a calculator program written in GAMBAS. It defines public variables to store operation numbers and values. It includes subroutines for each button click that append numbers or operate on values. The main operation subroutine uses a switch statement to perform calculations like addition, subtraction, multiplication, division, etc. based on the operation number stored. Additional subroutines convert values to binary, octal and hexadecimal formats.

1. Calculadora en la programación en GAMBAS
PUBLIC CAN AS Integer
PUBLIC OPE1 AS Single
PUBLIC OPE2 AS Single
PUBLIC SUB _new()
END
PUBLIC SUB Form_Open()
END
PUBLIC SUB Button17_Click()
TextBox1.Clear()
END
PUBLIC SUB Button18_Click()
ME.Close(0)
END
PUBLIC SUB Button12_Click()
TextBox1.Text = TextBox1.Text & "0"
END
PUBLIC SUB Button13_Click()
TextBox1.Text = TextBox1.Text & "."
END
PUBLIC SUB Button7_Click()
TextBox1.Text = TextBox1.Text & "1"
END
PUBLIC SUB Button8_Click()
TextBox1.Text = TextBox1.Text & "2"

2. END
PUBLIC SUB Button9_Click()
TextBox1.Text = TextBox1.Text & "3"
END
PUBLIC SUB Button4_Click()
TextBox1.Text = TextBox1.Text & "4"
END
PUBLIC SUB Button5_Click()
TextBox1.Text = TextBox1.Text & "5"
END
PUBLIC SUB Button6_Click()
TextBox1.Text = TextBox1.Text & "6"
END
PUBLIC SUB Button1_Click()
TextBox1.Text = TextBox1.Text & "7"
END
PUBLIC SUB Button2_Click()
TextBox1.Text = TextBox1.Text & "8"
END
PUBLIC SUB Button3_Click()
TextBox1.Text = TextBox1.Text & "9"
END
PUBLIC SUB Button10_Click()
CAN = 4
IF TextBox1.Text <> 0 THEN
OPE1 = TextBox1.Text
ELSE
OPE1 = 0

3. ENDIF
TextBox1.Clear
END
PUBLIC SUB Button15_Click()
CAN = 1
IF TextBox1.Text <> 0 THEN
OPE1 = TextBox1.Text
ELSE
OPE1 = 0
ENDIF
TextBox1.Clear
END
PUBLIC SUB Button14_Click()
CAN = 2
IF TextBox1.Text <> 0 THEN
OPE1 = TextBox1.Text
ELSE
OPE1 = 0
ENDIF
TextBox1.Clear
END
PUBLIC SUB Button11_Click()
CAN = 3
IF TextBox1.Text <> 0 THEN
OPE1 = TextBox1.Text
ELSE
OPE1 = 0
ENDIF
TextBox1.Clear
END
PUBLIC SUB Button16_Click()
IF TextBox1.Text <> 0 THEN
OPE2 = TextBox1.Text
ELSE
OPE2 = 0

4. ENDIF
TextBox1.Text = operacion(OPE1, OPE2, CAN)
END
PUBLIC FUNCTION operacion(v1 AS Float, v2 AS Float, opera AS Integer) AS Float
DIM re AS Float
DIM X, Y, Z, X1, Y1, Z1, X2, Y2, Z2, f, i AS Integer
DIM XX, MEA AS String
SELECT CASE opera
CASE 1
re = v1 + v2
CASE 2
re = v1 - v2
CASE 3
re = v1 * v2
CASE 4
re = v1 / v2
CASE 5
re = (v1 * v2) / 100
CASE 6
re = v1 ^ 2
Z2 = 1
CASE 7
re = v1 ^ 3
Z2 = 1
CASE 8
re = v1 ^ v2
Z2 = 1
CASE 9
re = 1 / v1
Z2 = 1
CASE 10
f=1
FOR i = 1 TO v1
f=f*i
NEXT
re = f
Z2 = 1
END SELECT
IF Z2 = 1 THEN
RETURN re
ELSE
RETURN Y1
ENDIF
END

5. PUBLIC SUB Button19_Click()
CAN = 5
IF TextBox1.Text <> 0 THEN
OPE1 = TextBox1.Text
ELSE
OPE1 = 0
ENDIF
TextBox1.Clear
END
PUBLIC SUB Button20_Click()
CAN = 6
IF TextBox1.Text <> 0 THEN
OPE1 = TextBox1.Text
ELSE
OPE1 = 0
ENDIF
TextBox1.Text = OPE1
END
PUBLIC SUB Button21_Click()
'numero binario
DIM valor, x1, x2, i AS Integer
DIM cadena, cadena2 AS String
valor = TextBox1.Text
WHILE valor > 0
x1 = valor MOD 2
x2 = Int(valor / 2)
cadena = cadena & Str(x1)
valor = x2
WEND
FOR i = Len(cadena) TO 1 STEP -1
cadena2 = cadena2 & (Mid(cadena, i, 1))
NEXT
TextBox1.Text = cadena2
END
PUBLIC SUB Button22_Click()

6. 'Calculo a octal de un número decimal
DIM valor, x1, x2, i AS Integer
DIM cadena, cadena2 AS String
' IF visor.Text <> 0 THEN
valor = TextBox1.Text
WHILE valor > 0
x1 = valor MOD 8
x2 = Int(valor / 8)
cadena = cadena & Str(x1)
valor = x2
WEND
FOR i = Len(cadena) TO 1 STEP -1
cadena2 = cadena2 & (Mid(cadena, i, 1))
NEXT
TextBox1.Text = cadena2
END
PUBLIC SUB Button23_Click()
'Calculo a hexadecimal de un número decimal
DIM valor, x1, x2, i AS Integer
DIM cadena, cadena2 AS String
valor = TextBox1.Text
WHILE valor > 0
x1 = valor MOD 16
x2 = Int(valor / 16)
IF x1 = 10 THEN
cadena = cadena & "A"
ELSE
IF x1 = 11 THEN
cadena = cadena & "B"
ELSE
IF x1 = 12 THEN
cadena = cadena & "C"
ELSE
IF x1 = 13 THEN
cadena = cadena & "D"
ELSE
IF x1 = 14 THEN
cadena = cadena & "E"
ELSE
IF x1 = 15 THEN
cadena = cadena & "F"
ELSE
cadena = cadena & Str(x1)
ENDIF
ENDIF
ENDIF
ENDIF
ENDIF
ENDIF

7. valor = x2
WEND
FOR i = Len(cadena) TO 1 STEP -1
cadena2 = cadena2 & (Mid(cadena, i, 1))
NEXT
TextBox1.Text = cadena2
END
PUBLIC SUB Button24_Click()
CAN = 7
IF TextBox1.Text <> 0 THEN
OPE1 = TextBox1.Text
ELSE
OPE1 = 0
ENDIF
TextBox1.Text = OPE1
END
PUBLIC SUB Button25_Click()
CAN = 8
IF TextBox1.Text <> 0 THEN
OPE1 = TextBox1.Text
ELSE
OPE1 = 0
ENDIF
TextBox1.Text = OPE1
END
PUBLIC SUB Button28_Click()
DIM k AS Float
k = Rad(TextBox1.Text)
TextBox1.Text = Sin(k)
END
PUBLIC SUB Button29_Click()
DIM k AS Float
k = Rad(TextBox1.Text)
TextBox1.Text = Cos(k)
END

8. PUBLIC SUB Button30_Click()
DIM k AS Float
k = Rad(TextBox1.Text)
TextBox1.Text = Tan(k)
END
PUBLIC SUB Button26_Click()
CAN = 9
IF TextBox1.Text <> 0 THEN
OPE1 = TextBox1.Text
ELSE
OPE1 = 0
ENDIF
TextBox1.Text = OPE2
END
PUBLIC SUB Button27_Click()
CAN = 10
IF TextBox1.Text <> 0 THEN
OPE1 = TextBox1.Text
ELSE
OPE1 = 0
ENDIF
TextBox1.Text = OPE2
END