Thank you for your replay @szymczyk It does't turn on I start a new project and then choose C++ language Then write the code and run it it refuses to give me the output and i try with another name but the same result. How do I get to the actual error message? 1 duplicate symbol for architecture x86_64 duplicate symbol '_main' in:     /Users/lamiaalkhunini/Library/Developer/Xcode/DerivedData/c-awfbaiszjqjdyzfyhvlstvnfmpbe/Build/Intermediates.noindex/c.build/Debug/c.build/Objects-normal/x86_64/l.o     /Users/lamiaalkhunini/Library/Developer/Xcode/DerivedData/c-awfbaiszjqjdyzfyhvlstvnfmpbe/Build/Intermediates.noindex/c.build/Debug/c.build/Objects-normal/x86_64/ll.o ld: 1 duplicate symbol for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation)