The Billion Shots™ on Instagram: "Few athletes in history have shown focus like Rafael Nadal. At the 2014 Rio Open, his concentration was tested in a lighthearted moment with a hostess, yet he stayed locked in as only Nadal can. It is a glimpse into the mindset that made him one of the greatest of all time. Called the "King of Clay," Nadal has won 14 French Open titles, more than any other player. He is also one of only two men to complete the Career Golden Slam, winning all four Grand Slams plu

Defining, Calling, and Declaring Functions in C++