Let's consider following code:
fork(); // Consider as A
fork() && fork() || fork(); // Consider B, C and D respectively
fork(); // Consider E
and,
The logical operator && has more precedence than ||, and have left to right associativity.
In case of AND (&&), after evaluation of left operand, right operand will be evaluated only if left operand evaluates to non-zero. In case of OR (||), after evaluation of left operand, right operand will be evaluated only if left operand evaluates to zero.
And, in fork(), parent process returns non-zero whereas a child process returns zero.
So, with above considerations
At level 5, we will have 20 processes running.
Therefore,
printf("Hi");
will be executed 20 times.
