fmt.Fprint() 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.Fprint() function in Go language formats using the default formats for its operands and writes to w. Here Spaces are added between operands when any string is not used as a parameter. 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 Fprint(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 or constant variables used in the code.

Return Value: It returns the number of bytes written and any write error encountered. Example 1:

// Golang program to illustrate the usage of
// fmt.Fprint() function

// Including the main package
package main

// Importing fmt and os
import (
    "fmt"
    "os"
)

// Calling main
func main() {

    // Declaring some const variables
    const name, dept = "GeeksforGeeks", "CS"

    // Calling Fprint() function which returns
    // "n" as the number of bytes written and 
    // "err" as any error ancountered
    n, err := fmt.Fprint(os.Stdout, name, " is a ",
                                dept, " portal.\n")

    // Printing the number of bytes written
    fmt.Print(n, " bytes written.\n")

    // Printing if any error encountered
    fmt.Print(err)

}

Output:

GeeksforGeeks is a CS portal.
30 bytes written.
<nil>

Example 2:

// Golang program to illustrate the usage of
// fmt.Fprint() function

// Including the main package
package main

// Importing fmt and os
import (
    "fmt"
    "os"
)

// Calling main
func main() {

    // Declaring some const variables
    const num1, num2, num3 = "a", "b", "c"

    // Calling Fprint() function which returns
    // "n" as the number of bytes written and
    // "err" as any error encountered
    n, err := fmt.Fprint(os.Stdout, num1, num2, num3, "\n")

    // Printing the number of bytes written
    fmt.Print(n, " bytes written.\n")

    // Printing if any error encountered
    fmt.Print(err)

}

Output:

abc
4 bytes written.
<nil>

In the above code, the constant variables used are strings hence spaces are not added in between two strings shown above in the output. Example 3:

// Golang program to illustrate the usage of
// fmt.Fprint() function

// Including the main package
package main

// Importing fmt and os
import (
    "fmt"
    "os"
)

// Calling main
func main() {

    // Declaring some const variables
    const num1, num2, num3 = 5, 15, 15

    // Calling Fprint() function which returns
    // "n" as the number of bytes written and 
    // "err" as any error encountered
    n, err := fmt.Fprint(os.Stdout, num1, num2, num3, "\n")

    // Printing the number of bytes written
    fmt.Print(n, " bytes written.\n")

    // Printing if any error encountered
    fmt.Print(err)

}

Output:

5 15 15
8 bytes written.
<nil>

In the above code, the constant variables used are numbers hence spaces are added in between two numbers shown above in the output.

fmt.Fprint() Function in Golang With Examples

Kanchan_Ray

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fmt.Fprint() Function in Golang With Examples

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