Podcast
Questions and Answers
What does a rune literal in Go represent?
What does a rune literal in Go represent?
- An octal number
- A string
- A single Unicode character (correct)
- A hexadecimal number
Which of the following is NOT a valid way to write a rune literal in Go?
Which of the following is NOT a valid way to write a rune literal in Go?
- 8-bit octal numbers (' ')
- 16-bit hexadecimal numbers (' u0061')
- Raw string literals (' ') (correct)
- 32-bit Unicode numbers (' U00000061')
When creating an interpreted string literal in Go, which characters cannot appear unescaped?
When creating an interpreted string literal in Go, which characters cannot appear unescaped?
- Backslashes (correct)
- Newlines
- Single quotes
- Double quotes
Why should double quotes be used to create an interpreted string literal in Go?
Why should double quotes be used to create an interpreted string literal in Go?
Which type of string literal is easier for including backslashes, double quotes, or newlines in Go?
Which type of string literal is easier for including backslashes, double quotes, or newlines in Go?
Which prefix is used to indicate a binary literal in Go programs?
Which prefix is used to indicate a binary literal in Go programs?
What is the purpose of raw string literals in Go?
What is the purpose of raw string literals in Go?
What is a way to represent an octal literal in Go that should be avoided as it can be confusing?
What is a way to represent an octal literal in Go that should be avoided as it can be confusing?
In Go, what character can be used to group by thousands in base 10 for integer literals?
In Go, what character can be used to group by thousands in base 10 for integer literals?
How are floating-point literals formatted when you want to use hexadecimal in Go?
How are floating-point literals formatted when you want to use hexadecimal in Go?
What is the impact of using underscores to format floating-point literals in Go?
What is the impact of using underscores to format floating-point literals in Go?
Which type of literal allows you to specify an exponent using the letter 'e' in Go?
Which type of literal allows you to specify an exponent using the letter 'e' in Go?
What character is used to delimit string literals in Go?
What character is used to delimit string literals in Go?
What are the possible values for a variable of bool type in Go?
What are the possible values for a variable of bool type in Go?
What is the zero value for a variable of bool type in Go if no initial value is assigned?
What is the zero value for a variable of bool type in Go if no initial value is assigned?
How many numeric types does Go have?
How many numeric types does Go have?
What is the zero value for all integer types in Go?
What is the zero value for all integer types in Go?
How many different numbers can be contained in a memory of 16 bits?
How many different numbers can be contained in a memory of 16 bits?
Study Notes
Literals in Go Programming
- There are five types of literals in Go: integer, floating-point, boolean, rune, and string literals.
Integer Literals
- An integer literal is a sequence of numbers.
- Integer literals are base 10 by default, but can be specified in binary (0b), octal (0o), or hexadecimal (0x) using prefixes.
- A leading 0 with no letter after it represents an octal literal, but is discouraged due to confusion.
- Underscores can be used to improve readability, but cannot be at the beginning or end of numbers, and cannot be consecutive.
Floating-Point Literals
- A floating-point literal has a decimal point to indicate the fractional portion of the value.
- They can also have an exponent specified with the letter e and a positive or negative number.
- They can be written in hexadecimal using the 0x prefix and the letter p for indicating any exponent.
- Underscores can be used to format floating-point literals.
Boolean Literals
- The bool type represents Boolean variables.
- Variables of bool type can have one of two values: true or false.
- The zero value for a bool is false.
Numeric Types
- Go has 12 numeric types, grouped into three categories: integer types, floating-point types, and complex type.
- Integer types include both signed and unsigned integers in a variety of sizes, from one to eight bytes.
- The zero value for all integer types is 0.
Rune Literals
- A rune literal represents a character and is surrounded by single quotes.
- Rune literals can be written as single Unicode characters, 8-bit octal numbers, 8-bit hexadecimal numbers, 16-bit hexadecimal numbers, or 32-bit Unicode numbers.
- There are also several backslash-escaped rune literals, with the most useful ones being newline, tab, single quote, and backslash.
String Literals
- There are two ways to indicate string literals: Interpreted String Literal and Raw String Literal.
- Interpreted string literals contain zero or more rune literals and interpret them into single characters.
- Raw string literals are delimited with backquotes and can contain any character except a backquote, with no escape character.
- Raw string literals are useful when including backslashes, double quotes, or newlines in the string.
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Description
Test your knowledge of Go program literals, including integer literals with different bases such as binary, octal, and hexadecimal. This quiz also covers the rare kind of literal found in Go programs.
