C++ Programming and Technical

In a function declaration, what does extern mean?

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C++ Other Question

Which of the following is not a basic computer network topology?

Options
1) Train topology
2) Bus topology
3) Star topology
4) Ring topology Which constructor is invalid for class cat?

Options
1) void cat :: cat() { feet=4;}
2) cat::cat(int f){feet=f;}
3) cat::cat(void){feet=8;}
4) cat::cat(int f){this->feet=f;}