well I tried this code but it does nothing

if(comp_move < (0.0f)) 
{ 
  comp_move = 0.0f; 
  comp_velocity = 1.0f; 
}
if(comp_move > (600.0f)) 
{ 
  comp_move = 600.0f; 
  comp_velocity = -1.0f; 
}

comp_move += 5.0f * comp_velocity;	

now you're getting it...refer to the overall sample code I gave you earlier. It's the same minus the velocity concept.

can we work on the code snippet  you gave me I have almost got it.

comp_move += 5.0f * comp_velocity;	

if(comp_move < (0.0f)) 
{ 
  comp_velocity = 1.0f; 
}
if(comp_move > (600.0f)) 
{ 
  comp_velocity = -1.0f; 
}

You are entertaining predictable consistent, I'll give you that. 

Sure. How would you like to work. Perhaps show us how you use that constant rate ping ponging value. Please. By all means. 

https://en.wikipedia.org/wiki/Ping-pong_scheme (Only the first paragraph directly applies)

Making pong here right?

3 minutes ago, GoliathForge said:

Perhaps show us how you use that constant rate ping ponging value.

what do you mean?

14 minutes ago, phil67rpg said:

can we work on the code snippet

what do you mean?

here is the code almost working I just want it to hit the left edge of the screen

comp_move += 0.1f * comp_velocity;	

if(comp_move <= (0.0f)) 
{ 
  comp_velocity = 1.0f; 
}
if(comp_move >= (710.0f)) 
{ 
  comp_velocity = -1.0f; 
}

well you will be happy that I solved my problem.

I believe I would...sort of...I disagree with trying to compare exact float values...go back to where you were. Just use the source I unscrambled. You'll find it very familiar because you wrote most of it. Don't let the timer thing bother you, or the c++ string stream dirty usage or extracting out unnecessary continual brush creation.

Kick it in the corner if it pleases. Only software. 

well you will be happy that I solved my problem.