Calculator
Calculator
System
Form1
Readout
Number
System
Number
System
Number
System
Cancel
System
CancelEntry
System
Number
System
Number
System
Number
System
Operator
System
Operator
System
Number
System
Number
System
Number
System
Operator
System
Operator
System
Number
System
Decimal
System
Operator
System
Percent
System
DecimalFlagw
NumOps-
	LastInput
OpFlag
FALSEH
@	Form_Load
Percent_Click
Readout
Caption
Cancel_Click
Decimal_Click,
CancelEntry_Click
Number_Click
Index
Number
Operator_Click
Operator
Readout_Clickc
Readout_Change5
Number_KeyPress
KeyAscii
Number_KeyDownS
KeyCode
Shift
command1
getfocus
sendmessage
BM_SETSTATE
LastKey
	lastindexA
ProcessKeyDown
lasttype
GoodKeys
Number_KeyUp4
ProcessKeyUp
KeyState
KEY_NUMPAD0
KEY_NUMPAD9Y
Operator_KeyDown
Operator_KeyUp{
KEY_NUMPAD
KEY_RETURN
Percent_KeyDown
Decimal_KeyDown
Cancel_KeyDown
CancelEntry_KeyDownD
Cancel_KeyUp
CancelEntry_KeyUp
Decimal_KeyUp
Percent_KeyUp
KEY_ADD
KEY_SUBTRACT
KEY_MULTIPLY
KEY_DIVIDE
KEY_DECIMAL
Decimal
Percent
Clear_Click
Cancel
CancelEntry
 Copyright (C) 1991 Microsoft Corporation-
 You have a royalty-free right to use, modify, reproduce and distribute-
 the Sample Application Files (and/or any modified version) in any way
 you find useful, provided that you agree that Microsoft has no warranty,
 obligations or liability for any Sample Application Files.s
 Modifications & Enhancements by Marcus Smaby - these modificationss
 & enhancements released to the public domainn
 Previously input operand.
 Second operand.
 Decimal point present yet?
 Number of operands.
 Indicate type of last keypress.
 Indicate pending operation.
 Handle to Control
 Was this a key we can process
 Remember state of Key to prevent repeat
 scan code of last key
Form_Load
 Initialization routine for the form.t
 Set all variables to initial values.t
Percent_Click
 Click event procedure for percent key (%).
 Compute and display a percentage of the first operand.-
Cancel_Click
 Click event procedure for C (cancel) key.
 Reset the display and initializes variables.t
Decimal_Click
 Click event procedure for decimal point (.) key.e
 If last keypress was an operator, initializek
 readout to "0." Otherwise, append a decimal
 point to the display.
CancelEntry_Click
 Click event procedure for CE (cancel entry) key.e
Number_Click
 Click event procedure for number keys (0-9).k
 Appends new number to the number in the display.e
Operator_Click
 Click event procedure for operator keys (+, -, x, /, =).
 If the immediately preceeding keypress was part of a 
 number, increment NumOps. If one operand is present, 
 set Op1. If two are present, set Op1 equal to the
 result of the operation on Op1 and the currentt
 input string, and display the result.
Can't divide by zero
Calculator
Number_KeyDown
ProcessKeyDown
 Key Table
   + = 43, - = 45, / = 47 * = 42
   % = 37, = = 61, c = 99,67, . = 46
 Avoid Auto Repeat
 classify keystroke & act 
 Debug.Print lastkey
 0 - 9
 p for percent
 C for Cancels
 <- or del for CancelEntry
Get the Handle
 Set control as pressed0
Number_KeyUp
ProcessKeyUp
 set control as unpressed
 Set Focus to Equals Key
Operator_KeyDown
Operator_KeyUp
Percent_KeyDown
Decimal_KeyDown
Cancel_KeyDown
CancelEntry_KeyDown
Cancel_KeyUp
CancelEntry_KeyUp
Decimal_KeyUp
Percent_KeyUp