ex4是用于mt4软件的临时文件。ex4文件反编译程序，用于还原源码，就这些了,ex4 is used for mt4 software, temporary files. decompile ex4 file program for restoring source code, that' s all

编译原理实验四 递归下降语义分析 附加实验报告-Recursive descent compiler principle experiment four additional experiments reported semantic analysis