A binary tree has a special node called the ____ node.

What does a plus (+) sign mean when it follows the name of an object style?

What will be an ideal response?

Write a program that prints the numbers 1 to 4 on the same line with each pair of adjacent numbers separated by one space. Do this several ways:

a) Using one statement with one stream insertion operator. b) Using one statement with four stream insertion operators. c) Using four statements.