c++ - 项目中的文件无法运行，无法交换。 它们之间也有问题-/重复符号/(Files in the project doesn't run, can't swap. between them and also there is a problem - /duplicate symbols/)

Question

I code in C++ in Xcode and have that problem :

(我在Xcode中用C ++编写代码并遇到了这个问题：)

 duplicate symbol '_main' in:
    /Users/admin/Library/Developer/Xcode/DerivedData/stepic-czeoumulvkebkydlwswhywbxwqvw/Build/Intermediates.noindex/stepic.build/Debug/stepic.build/Objects-normal/x86_64/4.main.o
    /Users/admin/Library/Developer/Xcode/DerivedData/stepic-czeoumulvkebkydlwswhywbxwqvw/Build/Intermediates.noindex/stepic.build/Debug/stepic.build/Objects-normal/x86_64/vector.main.o
duplicate symbol '_main' in:
    /Users/admin/Library/Developer/Xcode/DerivedData/stepic-czeoumulvkebkydlwswhywbxwqvw/Build/Intermediates.noindex/stepic.build/Debug/stepic.build/Objects-normal/x86_64/4.main.o
    /Users/admin/Library/Developer/Xcode/DerivedData/stepic-czeoumulvkebkydlwswhywbxwqvw/Build/Intermediates.noindex/stepic.build/Debug/stepic.build/Objects-normal/x86_64/theory.main.o
duplicate symbol '_main' in:
    /Users/admin/Library/Developer/Xcode/DerivedData/stepic-czeoumulvkebkydlwswhywbxwqvw/Build/Intermediates.noindex/stepic.build/Debug/stepic.build/Objects-normal/x86_64/4.main.o
    /Users/admin/Library/Developer/Xcode/DerivedData/stepic-czeoumulvkebkydlwswhywbxwqvw/Build/Intermediates.noindex/stepic.build/Debug/stepic.build/Objects-normal/x86_64/7taskmain.o
ld: 3 duplicate symbols for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

can anyone help?

(有人可以帮忙吗？)

why it writes duplicate /main/ from different files?

(为什么它从不同的文件写入重复的/ main /？)

  ask by Andrey Sheremeev translate from so

Answer 1

等待大神答复