C:\Users\lj\Desktop\课上\emp.o emp.c:(.data+0x0): multiple definition of `test'

This error message indicates that the symbol "test" is defined multiple times in the object files "emp.o" and "emp.c". This can happen if you have included the same source file in multiple places or if you have defined the same variable or function in multiple files. To resolve this error, you should ensure that each symbol is defined only once in your program.