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C + + Note 11: C + + extension--Variable detection enhancements

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It is legal to repeatedly define multiple variables with the same name in the C language, and multiple global variables with the same name will eventually be linked to the same address space on the global data area.

In C + +, it is not allowed to define multiple global variables with the same name, which means that C + + directly rejects this ambiguity.

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C + + Note 11: C + + extension--Variable detection enhancements

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