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WWhy are some ANSI ISO Standard library functions showing u

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WWhy are some ANSI ISO Standard library functions showing u

Q: Why are some ANSI/ISO Standard library functions showing up as undefined, even though I've got an ANSI compiler?

A:It's possible to have a compiler available which accepts ANSI syntax, but not to have ANSI-compatible header files or run-time libraries installed. (In fact, this situation is rather common when using a non-vendor-supplied compiler such as gcc.)

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