为什么照书上编的程序，仿真却出不来。明明对的嘛！
Info: *******************************************************************
Info: Running Quartus II Simulator
Info: Version 7.0 Build 33 02/05/2007 SJ Full Version
Info: Processing started: Tue Apr 28 22:21:42 2009
Info: Command: quartus_sim --read_settings_files=on --write_settings_files=off count10 -c count10
Info: Using vector source file "E:/Program Files/altera/70/quartus/instance/count10/count10.vwf"
Info: Option to preserve fewer signal transitions to reduce memory requirements is enabled
Info: Simulation has been partitioned into sub-simulations according to the maximum transition count determined by the engine. Transitions from memory will be flushed out to disk at the end of each sub-simulation to reduce memory requirements.
Info: Simulation partitioned into 1 sub-simulations
Info: Simulation coverage is
26.09 %
Info: Number of transitions in simulation is 210
Info: Quartus II Simulator was successful. 0 errors, 0 warnings
Info: Allocated 87 megabytes of memory during processing
Info: Processing ended: Tue Apr 28 22:21:45 2009
Info: Elapsed time: 00:00:03
可是那个波形出不来啊，不知怎么回事
