Chetan Bhagat’s Revolution 2020 and Raanjhanaa

Is Raanjhanaa a movie inspired by Chetan Bhagat's 'Revolution 2020' with some changes? Finished reading the book one year after I bought it. (I think it is insult to a writer if you buy but don’t read). I skipped pages because I did not really enjoy whole of it. Initial portion when characters are young is good while later parts are all politics and like pen-pushing. I liked this from page-16: Boy had stolen and eaten a chocolate cake from tiffin-box of a girl. The girl became furious and cried her heart out. So later, he takes a box of laddoos and brings to her but she refuses! Loved it when the boy says, "Why? You firang or what?" :) She says, "No, laddoos make you fat. I don't want to be fat." Boy hits back: "Chocolate cake doesn't make you fat? :) Later on much of his intelligence and humor is lost because he becomes love-sick. Same old story but with a love triangle. I wish they made the movie better than the book.