目的：
       
        基本掌握了 make 的用法，能在Linux系统上编程。
       
        环境：
       
        Linux系统，或者有一台Linux服务器，通过终端连接。一句话：有Linux编译环境。
       
        准备：
       
        准备三个文件：file1.c, file2.c, file2.h
               file1.c:
                      #include <stdio.h>
                      #include "file2.h"
                      int main()
                      {
                             printf("print file1$$$$$$$$$$$$$$$$$$$$$$$$/n");
                             File2Print();
                             return 0;
                      }

               file2.h:

                      #ifndef FILE2_H_
                      #define    FILE2_H_

                              #ifdef __cplusplus

                                    extern "C" {

                             #endif

                             void File2Print();

                             #ifdef __cplusplus

                                    }

                             #endif

                      #endif

               file2.c:
                      #include "file2.h"
                      void File2Print()
                      {
                             printf("Print file2**********************/n");
                      }