What is the output of app(1,4)? Assuming that b a + 1 = n is a power of 2, how many lines of output would app(a,b) produce in terms of n?

void app(int a, int b)

{

if (a == b)

System.out.println(a);

else { int c = (a + b) / 2;

app(a, c);

app(c + 1, b);

for (int i = a; i <= c; i++)

System.out.println(a + "," + i);

}

}