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 FREEBSD
dwarf_get_ord_name
DWARF_GET_AT_NAME(3) BSD Library Functions Manual DWARF_GET_AT_NAME(3)NAME
dwarf_get_ACCESS_name, dwarf_get_AT_name, dwarf_get_ATE_name, dwarf_get_CC_name, dwarf_get_CFA_name, dwarf_get_CHILDREN_name,
dwarf_get_DS_name, dwarf_get_DSC_name, dwarf_get_EH_name, dwarf_get_END_name, dwarf_get_FORM_name, dwarf_get_ID_name, dwarf_get_INL_name,
dwarf_get_LANG_name, dwarf_get_LNE_name, dwarf_get_LNS_name, dwarf_get_MACINFO_name, dwarf_get_OP_name, dwarf_get_ORD_name,
dwarf_get_TAG_name, dwarf_get_VIRTUALITY_name, dwarf_get_VIS_name -- retrieve the symbolic names of DWARF constants
LIBRARY
DWARF Access Library (libdwarf, -ldwarf)
SYNOPSIS
#include <libdwarf.h>
int
dwarf_get_ACCESS_name(unsigned val, char **str);
int
dwarf_get_AT_name(unsigned val, char **str);
int
dwarf_get_ATE_name(unsigned val, char **str);
int
dwarf_get_CC_name(unsigned val, char **str);
int
dwarf_get_CFA_name(unsigned val, char **str);
int
dwarf_get_CHILDREN_name(unsigned val, char **str);
int
dwarf_get_DS_name(unsigned val, char **str);
int
dwarf_get_DSC_name(unsigned val, char **str);
int
dwarf_get_EH_name(unsigned val, char **str);
int
dwarf_get_END_name(unsigned val, char **str);
int
dwarf_get_FORM_name(unsigned val, char **str);
int
dwarf_get_ID_name(unsigned val, char **str);
int
dwarf_get_INL_name(unsigned val, char **str);
int
dwarf_get_LANG_name(unsigned val, char **str);
int
dwarf_get_LNE_name(unsigned val, char **str);
int
dwarf_get_LNS_name(unsigned val, char **str);
int
dwarf_get_MACINFO_name(unsigned val, char **str);
int
dwarf_get_OP_name(unsigned val, char **str);
int
dwarf_get_ORD_name(unsigned val, char **str);
int
dwarf_get_TAG_name(unsigned val, char **str);
int
dwarf_get_VIRTUALITY_name(unsigned val, char **str);
int
dwarf_get_VIS_name(unsigned val, char **str);
DESCRIPTION
These functions return the symbolic name of a numeric DWARF constant.
Argument val specifies the numeric value whose symbolic name is desired.
Argument str should point to a location which will hold the returned NUL-terminated string containing the symbolic name of the specified
value.
The list of functions and the DWARF constants that they accept are:
dwarf_get_ACCESS_name() DW_ACCESS_* constants.
dwarf_get_AT_name() DW_AT_* constants.
dwarf_get_ATE_name() DW_ATE_* constants.
dwarf_get_CC_name() DW_CC_* constants.
dwarf_get_CFA_name() DW_CFA_* constants.
dwarf_get_CHILDREN_name() DW_CHILDREN_* constants.
dwarf_get_DS_name() DW_DS_* constants.
dwarf_get_DSC_name() DW_DSC_* constants.
dwarf_get_EH_name() DW_EH_PE_* constants.
dwarf_get_END_name() DW_END_* constants.
dwarf_get_FORM_name() DW_FORM_* constants.
dwarf_get_ID_name() DW_ID_* constants.
dwarf_get_INL_name() DW_INL_* constants.
dwarf_get_LANG_name() DW_LANG_* constants.
dwarf_get_LNE_name() DW_LNE_* constants.
dwarf_get_LNS_name() DW_LNS_* constants.
dwarf_get_MACINFO_name() DW_MACINFO_* constants.
dwarf_get_OP_name() DW_OP_* constants.
dwarf_get_ORD_name() DW_ORD_* constants.
dwarf_get_TAG_name() DW_TAG_* constants.
dwarf_get_VIRTUALITY_name() DW_VIRTUALITY_* constants.
dwarf_get_VIS_name() DW_VIS_* constants.
RETURN VALUES
These functions return DW_DLV_OK on success. If the DWARF constant denoted by argument val is not recognized, these function return
DW_DLV_NO_ENTRY.
SEE ALSO dwarf(3)BSD April 22, 2011 BSD
06-22-2010
