a) Write the definition of a subroutine that swaps the first and the last members of an array of 10 double-words. Note that the array is pointed by SI. b) Write the definition of another subroutine,...

a) Write the definition of a subroutine that swaps the first and the last members of an array of 10
double-words. Note that the array is pointed by SI.
b) Write the definition of another subroutine, which multiplies the least significant nibble and the most significant nibble of AX register. The result is to be saved into AL.