Go Printing to Stdout and Stderr: Difference between revisions

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=<tt>fmt.Printf()</tt>=
=<tt>fmt.Printf()</tt>=
{{External|https://golang.org/pkg/fmt/#Printf fmt.Printf()}}
<syntaxhighlight lang='go'>
<syntaxhighlight lang='go'>
import "fmt"
import "fmt"
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* <tt>[https://golang.org/pkg/fmt/#Printf fmt.Printf()]</tt>


Prints according to a format specifier. Format specifier documentation https://golang.org/pkg/fmt
Prints according to a format specifier. Format specifier documentation https://golang.org/pkg/fmt

Revision as of 00:51, 19 August 2023

Internal

Bootstrapping Functions

Both print() and println() are pre-declared functions, ready to use without any import.

print()

println()

func main() {
  println("something")
}

fmt.Printf()

https://golang.org/pkg/fmt/#Printf fmt.Printf()
import "fmt"

// ...
fmt.Printf("something")

Format Strings

The format strings contain conversion characters (ex. %s):


fmt.Printf("Hello %s", "Bob")



Prints according to a format specifier. Format specifier documentation https://golang.org/pkg/fmt

Pointers

fmt.Printf("%p\n", sPtr)

"%p" prepend the "0x" prefix.

Pointers can be also represented using "%X" (base 16, upper case characters).

Ints

fmt.Printf("%d\n",i)

Characters

fmt.Printf("%c\n",i)

Boolean Values

fmt.Printf("%t\n",b)