Need help with my function (Basic Question)

Hi, I need help with my function using if statements. When I try it with random pH its giving me incorect messages. Im not sure how to fix it. Heres what i have so far:

    message = "acidic";
    if 0<= pH, pH<7
    end   
    message = "neutral";
    if pH==7 
    end  

    message = "basic"; 
    if 7<pH, pH>=14
    end   

    message = "Not valid pH"; 
    if 0>pH, pH<14
   ph=0;     
end

Answer 1

[Jacob Gonzalez]

Step1: I think it would be better to replace your commas with && like so:

if 0 <= pH && ph < 7
  % code
end

To make code function, we would then place the messages within the if statements like so:

if 0 <= pH && ph < 7
  message = 'acidic';
end

Lastly, it is better form to you if-elseif-else in this situation:

if 0<= pH && pH < 7
  message = "acidic";   
elseif pH == 7
  message = "neutral";
elseif pH > 7 && pH <= 14
  message = "basic";
else
  message = "Not valid pH";
  pH=0;
end

Hope this helps you understand.

[Daud Muhammad]

A quick question why do you put ph=0; at the end? is this neccessary?