int main() {
unsigned short int v = 7; // First 13 MSB == 0; Last 3 LSB == 1 --> 0000000000000111
unsigned short int toggled_bit = (0xffff ^ v) ; // toggled_bit now have a bits pattern --> 1111111111111000
printf("Actual Variable == %u --- toggled bit value %u\n", v, toggled_bit);
}
The shortest answer, isn;t it?
Now a bigger code; write a function
Code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/errno.h>
unsigned short toggleBits ( unsigned short a_val) {
return (0xffff ^ a_val);
};
int main(int argc, **argv) {
unsigned short int val = 0;
if(argc < 2) exit(1);
val = (unsigned short) atoi(argv[1]);
printf(" val == %u\n" , val);
for(int i = 0; i < 4; i++) {
val = toggleBits(val);
printf(" val == %u\n" , val);
}
return 0;
}
However, if you wana just toggle a single bit (say n'th bit) , then instead of FFFF, use a value equivalent to 2^n (2 to the power n) and do the XOR operation exactly similar to the above code.
Let me know, if you need any specific question. You still need to explore yourself a lot by writing simple codes doing such bitwise operation to get more clarity.
Last edited by Praveen_218; 06-22-2010 at 02:05 PM..
Reason: Typo mistake corrections and some minor additions ...
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LEARN ABOUT ULTRIX
dwttogglebuttongadgetcreate
DwtToggleButtonGadgetCreate(3Dwt)DwtToggleButtonGadgetCreate(3Dwt)Name
DwtToggleButtonGadgetCreate - Creates a toggle button gadget.
Syntax
Widget DwtToggleButtonGadgetCreate (parent_widget, name,
override_arglist,
override_argcount)
Widget parent_widget;
char *name;
ArgList override_arglist;
int override_argcount;
Arguments
parent_widget
Specifies the parent widget ID.
name Specifies the name of the created widget.
override_arglist
Specifies the application override argument list.
override_argcount
Specifies the number of attributes in the application override argument list (override_arglist).
Description
The DwtToggleButtonGadgetCreate function creates an instance of the toggle button gadget and returns its associated gadget ID. A toggle
button gadget is similar in appearance and semantics to a toggle button widget. Like all gadgets, DwtToggleButtonGadgetCreate does not
have a window but uses the window of the closest antecedent widget. Thus, the antecedent widget provides all event dispatching for the
gadget. This currently restricts gadgets to being descendents of menu or dialog class (or subclass) widgets.
Inherited Attributes---------------------------------------------------------
Attribute Name Data Type Default
---------------------------------------------------------
Rectangle Attributes
DwtNx Position Determined by
the geometry
manager
DwtNy Position Determined by
the geometry
manager
DwtNwidth Dimension The width of
the label plus
margins
DwtNheight Dimension The height of
the label plus
margins
DwtNborderWidth Dimension zero
DwtNsensitive Boolean True
DwtNancestorSensitive Boolean The bitwise AND
of the parent
widget's
DwtNsensitive
and DwtNances-
torSensitive
attributes
Label Attributes
DwtNlabel DwtCompString Widget name
DwtNalignment unsigned char DwtAlignment-
Center
DwtNdirectionRToL Boolean False
DwtNhelpCallback DwtCallbackPtr NULL
---------------------------------------------------------
Widget-Specific Attributes------------------------------------------------------------
Attribute Name Data Type Default
------------------------------------------------------------
DwtNshape unsigned char DwtRectangular
DwtNvalue Boolean False
DwtNvisibleWhenOff Boolean True
DwtNvalueChangedCallback DwtCallbackPtr NULL
DwtNbuttonAccelerator char * NULL
DwtNacceleratorText DwtCompString NULL
------------------------------------------------------------
DwtNshape Specifies the toggle button indicator shape. You can pass DwtRectangular or DwtOval.
DwtNvalue Specifies a boolean value that, when False, indicates the button state is off. If True, the button state is on.
DwtNvisibleWhenOff
Specifies a boolean value that, when True, indicates that the toggle button is visible when in the off state.
DwtNvalueChangedCallback
Specifies the callback function or functions called when the toggle button value was changed. For this callback, the reason
is DwtCRValueChanged.
DwtNbuttonAccelerator
Sets an accelerator on a toggle button widget. This is the same as the DwtNtranslations core attribute except that only the
left side of the table is to be passed as a character string, not compiled. The application is responsible for calling
XtInstallAllAccelerators to install the accelerator where the application needs it.
DwtNacceleratorText
Specifies the compound-string text displayed for the accelerator.
Return Values
This function returns the ID of the created widget.
Callback Information
The following structure is returned to your callback:
typedef struct {
int reason;
XEvent *event;
int value;
} DwtTogglebuttonCallbackStruct;
The reason member is set to a constant that represents the reason why this callback was invoked. For this callback, the reason member can
be set to:
DwtCRValueChanged The user activated the
toggle button to change
state.
DwtCRHelpRequested The user selected Help.
The event member is a pointer to the Xlib structure XEvent, which describes the event that generated this callback. This structure is a
union of the individual structures declared for each event type. For information on XEvent and event processing, see the Guide to the Xlib
Library: C Language Binding.
The value member is set to the toggle button's current state when the callback occurred, either True (on) or False (off).
See Also
Guide to the XUI Toolkit: C Language Binding
Guide to the XUI Toolkit Intrinsics: C Language Binding
DwtToggleButtonGadgetCreate(3Dwt)
06-22-2010
