MATLAB: Repeated user input for even numbers

even numbersrepeated

The code needs to keep asking for user input until an even number is inputted. I've got this code so far:

a = input('Input a value: ');
b = 2;
   if rem(a,b) == 0
   disp('Your value is even.')
   else 
    a = input('Input a value of a');
   end

but this only works twice when an odd number has been entered. How do I get it to keep asking for an input until an even number has been entered?

The while loop will continually ask for a non-zero even integer until one is entered.

prompt= 'Input a value:  '
z = 1;
while mod(z,2)~=0
    z= input(prompt)
end

Very similar question was asked on the same day here:

prompt = 'Enter a number:';
S = input(prompt) ;
if mod(S,2)
    S = input(prompt) ;
end

The while loop will continually ask for a non-zero even integer until one is entered.

prompt= 'enter non zero even integer '
z = 0;
while z=0 || mod(z,2)~=0
    z= input(prompt)
end

If you'd like to avoid negative numbers, too,

while z<=0 || mod(z,2)~=0