Meet the robots

Problem:

Two robots land with their parachutes on an infinite one-dimensional number line. They both release their parachutes as soon as they land and start moving. They are allowed only to make use of the following functions.

I.   moveLeft() // robot moves to left by 1 unit in 1 unit time
II.  moveRight() // robot moves to right by 1 unit in 1 unit time
III. noOperation() // robot does not move and takes 1 unit time
IV.  onTopOfParachute() // returns true if the robot is standing on top of either of the parachute, else false
V.   didWeMeet() // returns true if the robot meets to the other robot, else false

Write a function in order to make the robots meet each other. Robots will be executing the same copy of this function.

Solution:

void meetRobots(Robot r1,Robot r2) {

       r1.moveLeft(), r2.moveLeft();

       while(!r1.onTopOfParachute() && !r2.onTopOfParachute()) {

           r1.moveLeft(), r2.moveLeft();

       }

       if(r1.onTopOfParachute()) {

           while(!r2.didWeMeet()) {

               r2.moveRight(),r1.noOperation();

           }

        } else {

           while(!r1.didWeMeet()) {

               r1.moveRight(),r2.noOperation();

           }

        }