CS360 Final -- December 10, 2002.

CS360 Final -- December 10, 2002

First it calls setjmp(j), which returns zero. The first line is ``Main: 0''.
Next, it calls a(0, j). This calls setjmp(m), which again returns zero. Thus, the second line is ``A: 0''.
Now, a() calls b(0, j, m), which prints ``B: 0'', and calls longjmp(j, 1).
The longjmp() will return from the setjmp() call in main(), which now sets i to 1. The next line will be ``Main: 1''.
Once again, main() calls a(), but this time with the arguments 1 and j. a() calls setjmp() again, which returns zero, so i is still 1. Thus, the next line is ``A: 1.''
Now, a() calls b(1, j, m), which prints ``B: 1'', and calls longjmp(m, 2).
The longjmp() returns 2 from the setjmp() call in a(), which means that i is now set to 3, and a() prints out ``A: 3.''
Now, a() calls b(3, j, m), which prints ``B: 3'', and calls longjmp(m, 4).
The longjmp() returns 4 from the setjmp() call in a(), which means that i is now set to 7, and a() prints out ``A: 7.''
Now, a() calls longjmp(j, 7), which returns 7 from the setjmp() call in main(). Thus, main() prints ``Main: 7'' and the program exits.

Thus, the output is:

Main: 0
   A: 0
   B: 0
Main: 1
   A: 1
   B: 1
   A: 3
   B: 3
   A: 7
Main: 7