You would be earning less than BTC0.00005 a day at the current difficulty. If you are wanting to test it out just to see how it works, by all means do whatever you think you can learn from. But it would be highly unwise to do this for any extended amount of time as you will be paying way more in electricity than you would be earning. As well as shortening the life of your pc.
There may be some alt coins you could look into that rely more on cpu mining, but I have not looked too much into the other ones yet so you would need to do your own research.