Linking...
4_1.obj : error LNK2005: _main already defined in 3_1.obj
Debug/xuexi.exe : fatal error LNK1169: one or more multiply defined symbols found
Error executing link.exe.

xuexi.exe - 2 error(s), 0 warning(s)
请问，我调试后出现这东西，我该怎么解决阿？？3_1.OBJ在什么文件里啊？？谢谢了