According to cppreference.com, if you use 0 as an integer constant, C considers it to be in octal, not decimal.
I can't wait to talk to a stranger about this at the next party.

https://en.cppreference.com/w/c/language/integer_constant.html

#C

Do we have a plan? No one knows.

[From the NY Times newsletter]

This is an fascinating map, from the Construction Physics newsletter. The population of a core swath of Nebraska, Kansas, Missouri, and Iowa peaked before 1900.

https://substackcdn.com/image/fetch/$s_!5KDc!,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2Fb9bff336-bb25-4744-8cd3-b73a39b7dea4_1600x1188.png