$*$

$*$ Compute and return the norm of vector v$,$ namely, the square root of the sum of

$*$ squares of elements of v$.$

$*$

$*$ @param v $-$ the address of first the vector array.

$*$ @param n $-$ the length of vector v$.$

$*$ @return $-$ the norm of vector v$.$

$*$

$*/$

float norm$($float $*$v$,$ n$)$;