Question

Write the definition of a function named alternator that receives no parameters and returns true the first time it is invoked, returns false the next time it is invoked, then true, false and so on, alternating between true/false on successive invocations.

Answer 1

Answer:

The solution code is written in C++

1. bool STATUS = true;
2. bool alternator ()
3. {
4.    if(STATUS){
5.        STATUS = false;
6.        return true;
7.    }else{
8.        STATUS = true;
9.        return false;
10.    }
11. }

Explanation:

We need a global variable to track the status of true or false (Line 1).

Next, create the function alternator (Line 2) and then check if current status is true, set the status to false but return the previous status boolean value (Line 5-6). At the first time of function invocation, it will return true.

The else block will set the STATUS to true and return the false (Line 7-9).