4. What is the difference between // comments and /* style comments? A. The double-slash comments (//) support multiple line of comments.

B. The slash-star (/* */) comments support single line of comments. C. The slash-star (/* */) comments support multiple line of comments. D. The double-slash comments (//) comments are often referred to as multiline comments. E. The slash-star (/* */) comments expire at the end of the line.

5. Which is the correct scientific notation 6.2510-27 expressed in C++? A. 6.25e-27 B. 6.25-e27 C. -6.25-e27 D. 6.25E27- E. -6.25E27 6. Given the following code segment, which statement is correct? std::cout << "Hi!" << std::endl; A. "cout" takes an user input from the keyword. B. "cout" is a variable that will store the value "Hi!". C. "std" refers to the C++ standard namespace. D. "endl" displays the string "Hi!" on the screen. E. "endl" is a variable that will store the value "Hi!".