1void foo(void); 2 3int main(void) 4{ 5 foo (); 6 7 for (;;) 8 ; 9} 10 11int a; 12 13void foo1(void) 14{ 15 a = 1; 16} 17 18void foo2(void) 19{ 20 a = 2; 21} 22 23void foo3(void) 24{ 25 a = 3; 26} 27 28 29