MATLAB: Fprintf- I dont want to print one result.

fprintfif/elseif/elsenot print a result

This is my code. I want that when the person put the value 0, the message print ONLY "Negative,has not being infected". But instance it give also the hour of being infected. 
x= input ('Enter x:  '); %Degree of reaction to the virus from a blood test.
if x==0
    disp ('Negative, has not being infected.')
   N=0;
elseif  x<=11
    N= 3*x + 36;
elseif x > 11 && x<=33
    N= x*x - 10;
elseif x > 33 && x<=64 
    N= x-6;   
end
fprintf('\n%g hours of being infected.\n',N)

Best Answer

clear
clc
x= input ('Enter x:  '); %Degree of reaction to the virus from a blood test.
showHours = 1;
if x==0
    disp ('Negative, has not being infected.')
   N=0;
   showHours = 0;
elseif  x<=11
    N= 3*x + 36;
    
elseif x > 11 && x<=33
    N= x*x - 10;
    
elseif x > 33 && x<=64 
    N= x-6;   
end
if showHours
    fprintf('\n%g hours of being infected.\n',N)
end
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