function[alpha,erreur,niter] =poinfixe(g,x0,itmax,eps)
title = 'iteration                roots                   eroors';
line = '------------------------------------------------------------';
fprintf('%s\n',title);
fprintf('%s\n',line);
alpha =x0;
for niter =1:itmax
x = alpha;
alpha=g(x);
erreur=abs(alpha-x);
fprintf('%.f . %.5f %.5f \n',niter,alpha,erreur);
if erreur<eps
return
end;
fprintf('%s\n',line)
end
fprintf('%s\n',line)
end