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| cc 01-第一个C语言程序.o 
 Undefined symbols for architecture x86_64:
 "_main", referenced from:
 implicit entry/start for main executable
 ld: symbol(s) not found for architecture x86_64
 clang: error: linker command failed with exit code 1 (use -v to see invocation)
 
 
 这是怎么回事啊??
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