迭代法也称辗转法，是一种不断用变量的旧值递推新值的过程，跟迭代法相对应的是直接法，即一次性解决问题。-Iterative method, also known as Law removed, continue to use the old value is a variable value new recursive process, with iterative wears corresponds to the direct method, namely a one-time problem solving.