Is it wrong to buy food for the homeless?

okay…every single time I see a homeless person asking me for change, I just tell them “I don’t have cash but I’ll buy you food if you want”
Is this wrong?
On one hand, I think that if no one ever gave anything to a homeless person, then people would stop asking for stuff. And that the person looks pretty healthy to me so he/she can just work.
But then again, I can’t ignore another human being and let him/her go hungry knowing I could’ve done something.
Your thoughts?