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Turbo C is horribly outdated: SourceForge.net: Turbo C - cpwiki.

Modern, free compilers worth looking into: Pelles C and Code::Blocks/MinGW

There's a lot of crappy books out there too. In the old days, before there was a standard for the C languages, some compilers accepted void main*. But that was a long time ago. Any decent, modern...