Sort three variables: Difference between revisions

=={{header|8086 Assembly}}==

===Sorting Unsigned Integers===

<lang asm>mov ax,6FFFh

mov bx,3456h

mov cx,0

;We'll consider these sorted when ax <= bx <= cx.

SortRegisters proc

cmp ax,bx

jbe continue

;if we got here, ax > bx. We don't know the relationship between bx and cx at this time.

cmp ax,cx

jbe swap_ax_and_bx

;if we got here, ax > bx, and bx > cx. Therefore all we need to do is swap ax and cx, and we're done.

xchg ax,cx

jmp endOfProc

swap ax_and_bx:

;if we got here, ax > bx, and ax <= cx. So all we have to do is swap ax and bx, and we're done

xchg ax,bx

jmp end ;back to top

continue: ;if we got here, ax <= bx.

cmp bx,cx

jbe end

;if we got here, ax <= bx, and bx > cx. Therefore all we need to do is swap bx and cx, and we're done.

xchg bx,cx

endOfProc: ;if we got here, ax <= bx, and bx <= cx. Therefore, ax <= bx <=cx and we are done.

;

SortRegisters endp </lang>