Try this
#include < stdio.h >
unsigned char swap_nibbles(unsigned char c)
{
unsigned char temp1, temp2;
temp1 = c & 0x0F;
temp2 = c & 0xF0;
temp1=temp1 << 4;
temp2=temp2 >> 4;
return(temp2|temp1); //adding the bits
}
int main(void)
{
char ch=0x34;
printf("\nThe exchanged value is %x",swap_nibbles(ch));
return 0;
}
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struct nibbles
{
int lnibble:4;
int unibble:4;
};
union swap
{
char byte;
struct nibbles nb;
};
int main()
{
union swap sw;
int temp;
sw.byte=0x12;
printf("Before swap:%x\n",sw.byte);
temp=sw.nb.lnibble;
sw.nb.lnibble=sw.nb.unibble;
sw.nb.unibble=temp;
printf("After swap:%x",sw.byte);
}
unsigned char nibbleSwap(unsigned char a)
{
return (a<<4) | (a>>4);
}
Masking operations in above example are not really needed.
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Nice. Here's mine, using the fact that c variables are passed by value...
#include < stdio.h >
unsigned char swap_nibbles(unsigned char c)
{
unsigned char temp;
temp = c & 0x0F;
c = c & 0xF0;
temp=temp << 4;
c=c >> 4;
return(c|temp); //adding the bits
}
int main(void)
{
char ch=0x34;
printf("\nThe exchanged value is %x",swap_nibbles(ch));
return 0;
}
unsigned char swap_nibbles(unsigned char c)
{
return( c << 4 | c >> 4);
}
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struct nibbles
{
int lnibble:4;
int unibble:4;
};
union swap
{
char byte;
struct nibbles nb;
};
int main()
{
union swap sw;
int temp;
sw.byte=0x12;
printf("Before swap:%x\n",sw.byte);
temp=sw.nb.lnibble;
sw.nb.lnibble=sw.nb.unibble;
sw.nb.unibble=temp;
printf("After swap:%x",sw.byte);
}
this is better code thanks to help me and i have the another code for the same similar answer
#include
main()
{
char x=0x43;
printf("%x",((x>>4) & 0x0f) | (x<<4) & 0x0f));
}
o/p=
if we give x=43 then it will convert to the '34',how means?
34 convert bytes means=00101011,
0x0f(15)=00001111,
x----------= 00101011
(x>>4)---------= 00000010
0x0f(15)-------= 00001111
---------
((x>>4)&0x0f)--= 00000010
---------
x---------- = 00101011
(x<<4)---------= 10110000
0x0f(15)-------= 00001111
---------
((x>>4)&0x0f)--= 00000000
---------
(x>>4)& 0x0f = 00000010
(x<<4) & 0X0f = 00000000
----------
doing (or) = 00000010 = 2
----------
finally we will get " 2 " .so print that 2 in to the hexa decimal value
please share me any question dought.
Thanks.......
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