The Canon — K&R C

The version that fixed the convention for half a century. Published on page 6 of the first edition of K&R, this program — pre-ANSI, no return type, no #include, lowercase greeting, no exclamation — has been retyped by more programmers than perhaps any other piece of source code in history. The default executable name a.out and the bare cc invocation place it squarely in the Unix V6/V7 era at Bell Labs.

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