1 void bar(); foo(int n)2 void foo(int n) { 3 for (int i = 0; i < n; ++i) for (int j = 0; j < n; ++j) 4 bar(); 5 } 6 quack()7 void quack() { 8 foo(4); 9 } 10 quack2()11 void quack2() { 12 foo(4); 13 } 14 15