一个将Fortran 77 转换为 Fortran 90 格式的小程序，由于时间关系，代码写得很混乱，功能也不完善，只包含了代码缩进，注释，换行，do-enddo语句的转换。-A Fortran 77 to Fortran 90 format is converted to a small program due to time constraint, the code is written very confusing, function not perfect, contains only