' GUI Calculator — Simple dialog-based calculator using DIALOG
#COMPILE EXE
#DIM ALL

DECLARE FUNCTION MessageBoxA LIB "USER32.DLL" ALIAS "MessageBoxA" (BYVAL hWnd AS LONG, BYVAL lpText AS ASCIIZ PTR, BYVAL lpCaption AS ASCIIZ PTR, BYVAL uType AS LONG) AS LONG

FUNCTION PBMAIN() AS LONG
    LOCAL hDlg AS LONG
    LOCAL msg AS STRING

    PRINT "GUI Calculator Demo"
    PRINT STRING$(30, 45)
    PRINT
    PRINT "Creating dialog... (requires runtime GUI support)"
    PRINT
    PRINT "Planned controls:"
    PRINT "  - Text display (EDIT control)"
    PRINT "  - Buttons 0-9, +, -, *, /, ="
    PRINT "  - Clear (C) button"

    msg = "Calculator dialog would appear here. See DIALOG NEW / DIALOG SHOW MODAL / CONTROL ADD for implementation."

    MessageBoxA(0, STRPTR(msg), "GUI Calculator", 0)

    PRINT STRING$(30, 45)
    PRINT "Calculator demo complete"

    FUNCTION = 0
END FUNCTION
