这是真么错误？？？？？？？？？？高手解释下！！！！
--------------------Configuration: 表达式求值 - Win32 Debug--------------------Compiling...
表达式求值.c
C:\Documents and Settings\Administrator\My Documents\myfile\表达式求值.c(61) : warning C4715: 'precede' : not all control paths return a value
C:\Documents and Settings\Administrator\My Documents\myfile\表达式求值.c(128) : warning C4715: 'get_top2' : not all control paths return a value
C:\Documents and Settings\Administrator\My Documents\myfile\表达式求值.c(149) : warning C4715: 'operter' : not all control paths return a value
表达式求值.obj - 0 error(s), 0 warning(s)
precede 'get_top2' operter使自己定义的函数！！！！！11
