Add cpp examples (#659)

* Added C++ robot project examples and set up sub .clang-format for them

* Ran formatter

wpilibcExamples/src/main/cpp/examples/Ultrasonic/src/Robot.cpp

@@ -0,0 +1,49 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2017 FIRST. All Rights Reserved.                             */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#include <AnalogInput.h>
+#include <IterativeRobot.h>
+#include <RobotDrive.h>
+
+/**
+ * This is a sample program demonstrating how to use an ultrasonic sensor and
+ * proportional control to maintain a set distance from an object.
+ */
+class Robot : public frc::IterativeRobot {
+public:
+	/**
+	 * Tells the robot to drive to a set distance (in inches) from an object
+	 * using proportional control.
+	 */
+	void TeleopPeriodic() override {
+		// sensor returns a value from 0-4095 that is scaled to inches
+		double currentDistance = ultrasonic.GetValue() * kValueToInches;
+		// convert distance error to a motor speed
+		double currentSpeed = (kHoldDistance - currentDistance) * kP;
+		// drive robot
+		myRobot.Drive(currentSpeed, 0);
+	}
+
+private:
+	// Distance in inches the robot wants to stay from an object
+	static constexpr int kHoldDistance = 12;
+
+	// Factor to convert sensor values to a distance in inches
+	static constexpr double kValueToInches = 0.125;
+
+	// Proportional speed constant
+	static constexpr double kP = 0.05;
+
+	static constexpr int kLeftMotorPort = 0;
+	static constexpr int kRightMotorPort = 1;
+	static constexpr int kUltrasonicPort = 0;
+
+	frc::AnalogInput ultrasonic{kUltrasonicPort};
+	frc::RobotDrive myRobot{kLeftMotorPort, kRightMotorPort};
+};
+
+START_ROBOT_CLASS(Robot)