problem with output RA2 and RA3

[savnik]

i change with this:

    CMCON = 7                       ' PortA = digital I/O    
	ANSEL = %00000011               ' Will set RA0-RA1 as analog and all others as digital 
    TRISA = %00000011  
    ADCON0 = %11000001	            ' Configure and turn on A/D Module
    ADCON1 = %00000000 	            ' Left justified. Six Least Significant bits of ADRESL are read as ‘0’

and work but i want only the positive result and not the negative of command: if (value - P2) >= 1
23 - 25 = -2 (P2=25)
27 - 25 = 2 (P2=25)
the pin PORTA.2 turn on , and for -2 and for 2 , but i want only for 2.
How to make this;

[mat janssen]

Test if the first number is greater then the second number and then do the subtraction. If otherwise then do nothing.

[savnik]

Test if the first number is greater then the second number and then do the subtraction. If otherwise then do nothing.

Thank you.
I use this code:

    If value >= P2 then
        If (value - P2) >= 1 then
            PORTB.1=1
            else
            PORTB.1=0
            endif
        endif