Read the following subprogram written in pseudocode:

function processTemperatures(readings)
    total = 0
    count = 0
    for temp in readings
        if temp > 0 then
            total = total + temp
            count = count + 1
        endif
    endfor

    if count > 0 then
        result = total / count
        return result
    else
        return -1
    endif
endfunction