fmt.Fprintln() Function in Golang With Examples
Last Updated :
05 May, 2020
In Go language, fmt package implements formatted I/O with functions analogous to C’s printf() and scanf() function. The fmt.Fprintln() function in Go language formats using the default formats for its operands and writes to w. Here Spaces are always added between the specified operands and a newline is appended at the end. 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 Fprintln(w io.Writer, a ...interface{}) (n int, err error)
Parameters: This function accepts two parameters which are illustrated below:
- w io.Writer: This is the specified standard input or output.
- a …interface{}: This is containing some strings and constant variables used in the code.
Return Value: It returns the number of bytes written and any write error encountered.
Example 1:
package main
import (
"fmt"
"os"
)
func main() {
const name, dept = "GeeksforGeeks" , "CS"
n, err := fmt.Fprintln(os.Stdout, name,
"is a" , dept, "portal." )
fmt.Print(n, " bytes written.\n" )
fmt.Print(err)
}
|
Output:
GeeksforGeeks is a CS portal.
30 bytes written.
<nil>
In the above code, it can be seen that in Fprintln() function, no newline (\n) was added still it prints a new line which can be seen from the above-shown output.
Example 2:
package main
import (
"fmt"
"os"
)
func main() {
const str1, str2, str3 = "a" , "b" , "c"
n, err := fmt.Fprintln(os.Stdout, str1, str2, str3)
fmt.Print(n, " bytes written.\n" )
fmt.Print(err)
}
|
Output:
a b c
6 bytes written.
<nil>
In the above code, it can be seen that in Fprintln() function, no space was added still it prints including space which can be seen from the above-shown output.
Like Article
Suggest improvement
Share your thoughts in the comments
Please Login to comment...