(PT) problem in exchange of two nibbles in a byte

[suresh babu]

hi, i am suresh.  in an interview i was asked to reverse two nibbles in a byte of data.
 
the question is as follows.  suppose a number is assigned to a character like
 
char c=0x82 then, a function should be described such that it will return number as 0x28
 
my way of approach is as follows
 
void main(){  char c=0x82;  char exch_nibbles(char);  clrscr();  printf("\nThe exchanged value is %x",exch_nibbles(c));  getch();}char exch_nibbles(char c){  char temp1, temp2; temp1=c & 0x0F;  //to obtain last four bits temp2=c & 0xF0;  //to obtain first four bits
  //printf("\nThe temp1 value is %x",temp1);  //printf("\nThe temp2 value is %x",temp2);
  temp1=temp1 << 4;  //shifting the last four bits to left    temp2=temp2 >> 4;  //shifting the first four bits to right
  printf("\nThe temp1 value after shifting is %x",temp1);  printf("\nThe temp2 value after shifting is %x",temp2);
  return(temp2|temp1); //adding the bits}but in the above program, temp1 is taking one byte of memory n value stored in it is 02, but temp2 is taking 2 bytes of memory and storing value as FFF8 before shifting. 
 
i had tried this program using Turboc3 compiler
 
pls suggest modification in my program r any other approach to solve this problem
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