In this tutorial you will learn about the Swift Basic Syntax and its application with practical example.
Swift Basic Syntax
In this article, we will explore about various basic syntax in swift.
Swift Printing and String interpolation
In Swift, print() function is used to print a value and \() for string interpolation as following –
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var name = "John" var age = 25 print("I am \(name). I am \(age) years old") |
Swift Comments
Swift Comments are a set of statements that are not executed by the Swift compiler and interpreter. The use of comments makes it easy for humans to understand the source code.
Swift Single-line Comments:-
A ‘//’ (double forward slash) is used to specify a single line comment, which extends up to the newline character.
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// It prints Hello, World! print("Hello, World!") |
Output:-
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Hello World! |
Swift Multi-line Comments:-
If you want to comment multiple lines then you can do it using /* and */, everything in between from /* to */ is ignored by the compiler-
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/* It prints Hello World! */ print("Hello, World!") |
Output:-
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Hello World! |
Semicolons In Swift
In Swift it is not mandatory to put a semicolon (;) at the end of each statement, it is optional in swift.But, if you are typing multiple statements in single line, then it is necessary to use a semicolon as a delimiter, otherwise the compiler will raise a syntax error.
Example 1:-
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var str = "Hello, World!" |
OR
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var str = "Hello, World!"; |
Here, both the statements are valid swift statement.
Example 2:-
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<span class="kwd">var</span><span class="pln"> str</span><span class="pun">=</span> <span class="str">"Hello, World!"</span><span class="pun">;</span> <span class="kwd">print</span><span class="pun">(</span><span class="pln">str</span><span class="pun">)</span> |
Swift Whitespaces
In Swift, Whitespace is used to indicate blanks, tabs, newline characters, comments. Whitespace are also useful separate one part of any statement from another.
Example:-
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var str = "Hello, World!"; |
