1 extern long long foo (); 2 3 long long sub1()4 sub1 () 5 { 6 char junk[10000]; 7 register long long a, b, c; 8 9 b = foo (); 10 11 setjmp (); 12 a = foo (); 13 c = a - b; 14 return c; 15 } 16