Read your datafile however you want (using textscan, or csvread, or dlmread, or readtable) into a matrix. For example,
m = cell2mat(textscan(fid, '%f %f %f %f')); %or whatever the format is
Multiply the last column of your matrix by 10000, round it just to be sure, and take the modulo with 2 and you get your flag:
m = [1 2 3 3.2341; 4 5 6 2.3450; 7 8 9 1.2320; 10 11 12 8.9871]; %for example
flag = mod(round(m(:, end) * 1e4), 2)
