fmt.Printf() Function in Golang With Examples
Last Updated :
05 Mar, 2021
In Go language, fmt package implements formatted I/O with functions analogous to C’s printf() and scanf() function. The fmt.Printf() function in Go language formats according to a format specifier and writes to standard output. Moreover, this function is defined under the fmt package. Here, you need to import the “fmt” package in order to use these functions.
Syntax:
func Printf(format string, a ...interface{}) (n int, err error)
Parameters: This function accepts two parameters which are illustrated below:
- format string: This contains some strings along with some verbs.
- a …interface{}: This contains specified constant variables.
Return Value: It returns the number of bytes written and any write error encountered.
Conversion Characters:
Conversion Characters |
Description |
%b |
It is used to format base 2 numbers |
%o |
It is used to format base 8 numbers |
%O |
It is used to format base 8 numbers with 0o prefix |
%d |
It is used to format base 10 numbers with lower-case letters for a-f |
%x |
It is used to format base 16 numbers with upper-case letters for A-F |
%X |
It is used to format base 16 numbers |
%g |
It is used to format float values |
%s |
It is used to format string values |
%t |
It is used to format true or false values |
%e |
It is used to format scientific values |
Example 1:
Go
package main
import (
"fmt"
)
func main() {
const name, dept = "GeeksforGeeks" , "CS"
fmt.Printf( "%s is a %s Portal.\n" , name, dept)
}
|
Output:
GeeksforGeeks is a CS portal.
Example 2:
Go
package main
import (
"fmt"
)
func main() {
const num1, num2, num3 = 5 , 10 , 15
fmt.Printf( "%d + %d = %d\n" , num1, num2, num3)
}
|
Output:
5 + 10 = 15
Example 3:
Go
package main
import (
"fmt"
)
func main(){
var str = "Geeksforgeeks"
fmt.Printf( "The string is %s \n" , str)
var num1 int = 21
fmt.Printf( "The decimal value is %d \n" , num1)
var num2 float32 = 7.786
fmt.Printf( "The floating point is %g \n" , num2)
var num3 int = 14
fmt.Printf( "The binary value of num3 is %b \n" , num3)
var num4 = 4 + 1i
fmt.Printf( "Scientific Notation of num4 : %e \n" , num4)
}
|
Output:
The string is Geeksforgeeks
The decimal value is 21
The floating point is 7.786
The binary value of num3 is 1110
Scientific Notation of num4 : (4.000000e+00+1.000000e+00i)
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