Pretty much. If you want to compare two floats a and b within some precision eps, use: abs(a - b) <= eps*0.5*(a + b) or even (abs(a - b) <= eps*abs(a

Pretty much. If you want to compare two floats a and b within some precision eps, use: abs(a - b) <= eps*0.5*(a + b) or even (abs(a - b) <= eps*abs(a)) && (abs(a - b) <= eps*abs(b)) which is implemented in Boost [0]. [0] http://www.boost.org/doc/libs/1_34_0/libs/test/doc/components/test_tools/floating_point_comparison.html http://www.boost.org/doc/libs/1_34_0/libs/test/doc/component...