While loop and arrays

I wanted to create a loop and store the values of "secsum" until the value of it is equal to "firstsum" or 7. But it doesn't work :( What do you think is wrong with it?

firstsum = floor(rand*6+1) + floor(rand*6+1);
j=1;           
  while j>=1

      secsum(j) = floor(rand*6+1) + floor(rand*6+1);

          if (secsum(j)==firstsum)
              fprintf('You WIN with the sequence: %.0f %.0f',firstsum,secsum);
              j=0;

          elseif (secsum(j)==7)
              fprintf('You LOSE with the sequence: %.0f %.0f',firstsum,secsum);
              j=0;
              
          else
              j=j+1;

          end   

  end
   

[DGM]

secsum is a vector, so either exit condition will produce multiple lines. If you only want to print the last result of secsum, just do

fprintf('You WIN with the sequence: %.0f %.0f\n',firstsum,secsum(j));

If you want to print the whole secsum vector, you can try using mat2str or some other method to get it into the output string.