u_int c = u_char a + u_char b

        list    p=PIC18f8722
        #include p18f8722.inc
; Begin
        code    0
        goto    initialize

        udata
a       res .1
b       res .1
c       res .2
; Start
        PRG code
initialize
; Set a and b here
main
        movf    a, W
        addwf   b, W
        movwf   c
        movlw   .0
        clrf    c + 1
        addwfc  c + 1
exit
        end