8051 code to find a number is even or odd

    A negative number has it's msb as binary 1 ...Hence we rotate the number through carry to the left and then decide upon the status of the carry flag .

            ORG 000h

            MOV A,#number   ;The number to be checked for positive  or negative

            RLC A ;rotates the accumulator left through carry

            JC  neg

            MOV A,#00h ; moving 0 to show its positive

            SJMP end

            neg: MOV A,#01h ;moving 1 to accumulator to show the number is negative ...you can do any other operation.

            end:  NOP

            END