Comments in Swift are nonexecutable text.
You can use comments as notes, explanations, or reminders to someone who will be reading your code.
You can begin a single-line comment with two forward slashes //.
You can open a multi-line comment using a forward slash and an asterisk (/*) and close it using an asterisk followed by a forward slash (*/).
Multiline comments can be nested:
// this is a single-line comment /* this is a multiple- line comment */ /* this is a comment /* this is a comment inside another comment */ still a comment! */
In Swift, as in most programming languages, you insert comments into your code using two forward slashes ( // ):
// this is a comment // this is another comment
The // characters mark the line as a comment. The compiler ignores comments at compilation time.
If you have several lines of comments, it is better to use the /* and */ combination to denote a block of statements as comments. For example:
/* this is a comment this is another comment */
The two preceding lines are marked as a comment.
You can also nest comments, as shown in the following example:
// this is a comment var myAge = 25/*from ww w.j a va 2 s. co m*/ var radius = 10.1 var circumference = 2 * 3.14 * radius var strMyAge = "My age is " + String(myAge) /* this is a comment this is another comment */ print(strMyAge)
To comment the entire block of code, enclose everything within the /* and */ , as shown here:
/* // this is a comment/* ww w.jav a 2s. c om*/ var radius = 10.1 var myAge = 25 var circumference = 2 * 3.14 * radius var strMyAge = "My age is " + String(myAge) /* this is a comment this is another comment */ print(strMyAge) */