C++ Comments

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 start with two forward slashes (//).

/* 

This is a C-like comment. The program determines whether an integer is odd or even.

*/

 #include < iostream >

 using namespace std;

 int main( ) {

 int num;              // This is a C++ single-line comment.

 // read the number  

 cout << "Enter number to be tested: ";

 cin >> num;

 // see if even or odd  

if ((num%2)==0) cout << "Number is even\n"; else cout << "Number is odd\n";

 return 0; 

 }

C++ Multi-line Comments

Multiline comments cannot be nested but a single-line comment can be nested within a multiline comment.

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!";