生成随机数的一个小程序，这种方法每次调用第一次产生的随机数相同率很高，但是做个循环连续调用几次，然后调用最后一次得到的随机数，就可以避免这种问题-Random Number Generation of a small program called this method the first time the same number of random high rate But to be a continuous cycle called several times, and then the last one was calling random numbers, such problems can be avoided