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comp.lang.c FAQ list · Question 20.11

Q: Can I use base-2 constants (something like 0b101010)?
Is there a printf format for binary?

A: No, on both counts, although there are various preprocessor tricks you can try (see the links below). You can convert base-2 string representations to integers with strtol. If you need to print numbers out in base 2, see the example code in question 20.10.

Additional links:

example by Jack Klein

preprocessor trick by Karl Heuer

prettier preprocessor trick by Bill Finke

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