Flash cards
Review the key moves
What is the main idea behind C++ Comments?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
Which statement best captures the main point of this lesson?
Complete the missing token from the example code.
// ___ is a comment cout << "Hello World!";Put the learning moves in the order that makes the concept easiest to apply.
Comments can be used to explain C++ code, and to make it more readable. It can also be used to prevent execution when testing alternative code. Comments can be singled-lined or multi-lined.
Single-line Comments
Single-line comments start with two forward slashes ( // ).
Any text between // and the end of the line is ignored by the compiler (will not be executed).
This example uses a single-line comment before a line of code:
Example
// This is a comment cout << "Hello World!";This example uses a single-line comment at the end of a line of code:
Example
cout << "Hello World!"; // This is a commentC++ Multi-line Comments
Multi-line comments start with /* and ends with */ .
Any text between /* and */ will be ignored by the compiler:
Example
/* The code below will print the words Hello World! to the screen, and it is
amazing */
cout << "Hello World!";It is up to you which you want to use. Normally, we use // for short comments, and /* */ for longer.