US STOCKS-Futures gain ahead of manufacturing, housing data
* Forest Labs surges after Actavis confirms acquisition
* Maker of Candy Crush files for U.S. IPO
* Futures up: Dow 21 pts, S&P 2.5 pts, Nasdaq 4 pts
NEW YORK, Feb 18 (Reuters) - U.S. stock index futures were slightly higher on Tuesday after Wall Street posted its biggest weekly percentage gains of the year, with investors looking towards a batch of economic data for clues on the health of the economy.
* U.S. stocks closed higher on Friday, with major indexes notching a second straight week of gains as investors shrugged off some weak economic data that was attributed to bad weather.
* U.S. markets were closed Monday for Presidents Day.
* Shares of Forest Laboratories Inc rocketed more than 35 percent in premarket trading after Actavis said it would acquire the specialty pharmaceuticals company in a massive cash and stock deal valued at about $25 billion.
* Coca-Cola Co reported an 8.3 percent fall in quarterly earnings, hurt by the separation of its bottling operations in Brazil and the Philippines. The stock was down 0.6 percent in premarket trading.