Help about formula to choose value RRS feed

  • Question

  • Hi i need some help
    what formula may i use to type my desired value for example 
    i need 0 or above value don't wanna negative value when the value goes negative it should be 0
    like 70-80=-10 but i suppose it's 0 and 80-70=10 it's 10
    how can i do this?
    Friday, January 30, 2015 8:43 PM