执行一段 h263的源码程序，出现了如下问题
执行第一次  出错如下：
  [C++ Warning] main.cpp(73): W8060 Possibly incorrect assignment
  [C++ Warning] main.cpp(129): W8060 Possibly incorrect assignment
  [C++ Warning] main.cpp(132): W8060 Possibly incorrect assignment
  [C++ Warning] main.cpp(135): W8060 Possibly incorrect assignment
  [C++ Warning] main.cpp(142): W8060 Possibly incorrect assignment
  [C++ Warning] main.cpp(148): W8060 Possibly incorrect assignment
  [C++ Warning] main.cpp(161): W8060 Possibly incorrect assignment
  [C++ Warning] main.cpp(310): W8070 Function should return a value
  [Linker Fatal Error] Fatal: Unable to open file 'VCLE50.LIB'

执行第二次   出错就只剩下了
[Linker Fatal Error] Fatal: Unable to open file 'VCLE50.LIB'

请教：
      这是为什么  Function should return a value   是否要返回一个值才OK ？