知识要点：理解2 进制数的乘法

运行结果先输出00000010 ,然后输出11111101,就是1011111101 换算后等于10 进制765,就是两数相乘的结果

注意是从高向低排列,同时该数已经超过256, 所以进位cy=1-knowledge elements : two 229 understanding of the number of multiplication operations were first exported 00000010. then output 11111101, 1011111101 converted 229 of 765 to 10. 2 is the result of several multiplication attention from high to low order, and that the number has exceeded 256, so we have a place cy =