Nibbles program...

[sreeramu]

Hai can any one explain this program to me in the clear way . I am not able to understand this code clearley so i am asking to you . Thanks in advance

#include <stdio.h> 
unsigned char swap_nibbles(unsigned char c) 
{ unsigned char temp1 , temp2; 
temp1  = c & 0 x0F; 
temp2  = c & 0 xF0; 
temp1 =temp1  << 4; 
temp2 =temp2  >> 4; 
return(temp2 |temp1); //adding the bits 
} int main(void) 
{ char ch=0 x34; 
printf("\nThe exchanged value is %x",swap_nibbles(ch)); 
return 0; 
}

[hk_mp5kpdw]

Jeesh, how about some formating?

#include <stdio.h> 

unsigned char swap_nibbles(unsigned char c) 
{
    unsigned char temp1 , temp2; 
    temp1  = c & 0x0F;   // Zeroes last 4 bits of c (preserves first 4)
    temp2  = c & 0xF0;   // Zeroes first 4 bits of c (preserves last 4)
    temp1 =temp1  << 4;   // Shifts first 4 bits so they are the last 4 bits
    temp2 =temp2  >> 4;   // Shifts last 4 bits so they are the first 4 bits
    return(temp2 |temp1); // Combines the results of the first and last 4 bits so
                          // they wind up swapped with each other based on original c value
}

int main(void) 
{
    unsigned char ch=0x34;
    printf("\nThe exchanged value is &#37;x",swap_nibbles(ch)); 
    return 0; 
}

[sreeramu]

Thank you for your replay...