Move all C++ tests to cpp.

cpp/shift_size.cpp

@@ -0,0 +1,17 @@
+#include <iostream>
+#include <iomanip>
+
+int main ( )
+{
+	std::cout << "shift amount: ";
+	int a;
+	
+	std::cin >> a;
+
+	int b = 1;
+
+	int c = b << a;
+
+	std::cout << " 1 << " << a << " = " << std::hex << c << std::endl;
+	return 0;
+}