XP系统，VC6.0编程环境。验证BP神经网络的函数逼近能力，模拟Sin函数的输出。在View中分别用“-”、“o”代表Sin函数的原输出值和BP的输出值。-XP system,VC6.0. BP network is used to approximate the output of sin function.In th view.cpp, - shows the value of sin function and 0 shows the value of BP network.