完全使用标准 C++ 编写的文件分割合并程序。采用面向过程的编程风格，也就是俗称的 C 风格。希望各路高手踊跃发言，指出其不足之处，提出整改意见、方案等。 -Completely using standard C++ Partition the documents prepared by the merging process. Process-oriented programming style, which is commonly known as the C style. Hope t