C program.....can anyone tell me how this program works in detail?

Question

Precedance
https://code.sololearn.com/cKUohnX6GX39/?ref=app

Answer 1

The printing of the first integer can end up displaying either 10 or 11 depending on the compiler due to Anna's link discussion. The second integer is non-zero so the not operator takes that as true and the false is printed as zero.

Answer 2

Undefined behavior

https://stackoverflow.com/questions/949433/why-are-these-constructs-using-pre-and-post-increment-undefined-behavior