Discussion
Choose the right declaration of longjmp() function.
Answer: A
Correct answer: void longjmp(jmp_buf environment, int value)
longjmp takes the jmp_buf saved by setjmp and an int, and restores the saved environment - whereupon setjmp appears to return that value. A value of 0 is silently changed to 1, so that the caller can always distinguish a longjmp arrival from the original call.
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