Who can help me checking my Programming

[skimask]

HELLO skimask your post 2 source code...i can use in the my hardware part now i facing the problme is the temperature sensor no stable...i using the voltage divide rule to give the input on port A.0 rite...and when i start running the temperature will going to high to 255oC and why no stable same time i not use the sensor to burn on fire the value will automative increase or decrease and now i knw how to on the alarm on the portd ad...i try whole night and get the result ad....thanks....and who can let me kwn why the temperature sensor on this source code cant working stable and who can give me ideal or commnet....!
thanks....!

Know what a 4-20mA current loop is?