void defineNewValueForHexDigit$($unsigned int& param$)\{$

unsigned int digitNumber;

unsigned int newValue;

unsigned int result $=$ param; $//$ Keep the original value

cout $<<$ "Original data value $($hex$)="<<$ hex $<<$ param $<<$ endl;

digitNumber $=$ getDigitNumber$()$; $//$ Get digit number from user $(0=$ rightmost$)$

newValue $=$ getNewValue$()$; $//$ Desired value for selected digit

$//$ Step $1$: Clear the specific hex digit $(4$ bits$)$ at the specified position

unsigned int clearMask $=$ ~$(0$xF $<<($digitNumber $*4))$; $//0$xF $(1111$ in binary$)$ clears $4$ bits

result &$=$ clearMask; $//$ Clear the hex digit at the desired position

$//$ Step $2$: Insert the new value into the cleared digit's position

unsigned int shiftedNewValue $=($newValue & $0$xF$)<<($digitNumber $*4)$; $//$ Ensure newValue is max $4$ bits

result $|=$ shiftedNewValue; $//$ Set the new value in the correct position

$//$ Display the result without leading zeros

if $($result $==0)\{$

cout $<<$ "Modified data value $=0"<<$ endl;

$\}$ else $\{$

cout $<<$ "Modified data value $($hex$)="<<$ hex $<<$ result $<<$ endl;

$\}$

$//$ Update the parameter with the result

param $=$ result;

$\}$