程序编写过程中采用模块化编程，逐步实现每个模块的功能，并写测试代码对逐个模块进行测试，确保每个模块运行结果输出正确。-Modular programming in the programming process, and gradually realize the function of each module, and write test code to test the module one by one, to ensure that the resulting output for e