The forth chapter introduces achievement of calculating charge about Short Message, the main rule of calculating charge, the sameness and differentia of every program and the analysis of the results.
The forth chapter introduces achievement of calculating charge about Short Message, the main rule of calculating charge, the sameness and differentia of every program and the analysis of the results.
第四章介绍了短信计费的实现，计费总体原则，各程序的相同点和不同点，以及对结果进行分析。