请教一问题?

VC上编译出现以下错误信息,如何解决?多谢! Linking... LIBCD.lib(wincrt0.obj) : error LNK2001: unresolved external symbol _WinMain@16 Debug/Wenjian.exe : fatal error LNK1120: 1 unresolved externals Error executing link.exe.
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