打印质数的各种算法，首先介绍了教科书上的实现方法，然后从减小时间复杂度的方向出发，介绍了几种打印质数的算法，C++实现。-The number of print quality algorithm, first introduced on the implementation of textbooks, then reduce the time complexity from the direction, describes several printing prime numbers algorithm, C++ implementation.