fmt.Sscanf() Function in Golang With Examples

In Go language, fmt package implements formatted I/O with functions analogous to C’s printf() and scanf() function. The fmt.Sscanf() function in Go language scans the specified string and stores the successive space-separated values into successive arguments as determined by the format. 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 Sscanf(str string, format string, a ...interface{}) (n int, err error)

Parameters: This function accepts three parameters which are illustrated below:

• str string: This parameter contains the specified text which is going to be scanned.
• format string: This parameter is the different types of format for each elements of the specified string.
• a …interface{}: This parameter receives each elements of the string.

Returns: It returns the number of items successfully parsed.

Example 1:

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

// Including the main package
package main

// Importing fmt
import (
    "fmt"
)

// Calling main
func main() {

    // Declaring two variables
    var name string
    var alphabet_count int

    // Calling the Sscanf() function which
    // returns the number of elements
    // successfully parsed and error if
    // it persists
    n, err := fmt.Sscanf("GFG is having 3 alphabets.",
      "%s is having %d alphabets.", &name, &alphabet_count)

    // Below statements get
    // executed if there is any error
    if err != nil {
        panic(err)
    }

    // Printing the number of
    // elements and each elements also
    fmt.Printf("%d: %s, %d\n", n, name, alphabet_count)

}

Output:

2: GFG, 3

Example 2:

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

// Including the main package
package main

// Importing fmt
import (
    "fmt"
)

// Calling main
func main() {

    // Declaring some variables
    var name string
    var alphabet_count int
    var float_value float32
    var boolean_value bool

    // Calling the Sscanf() function which
    // returns the number of elements
    // successfully parsed and error if
    // it persists
    n, err := fmt.Sscanf("GeeksforGeeks 13 6.7 true",
               "%s %d %g %t", &name, &alphabet_count,
                        &float_value, &boolean_value)

    // Below statements get executed
    // if there is any error
    if err != nil {
        panic(err)
    }

    // Printing the number of elements
    // and each elements also
    fmt.Printf("%d: %s, %d, %g, %t", n, name,
      alphabet_count, float_value, boolean_value)

}

Output:

4: GeeksforGeeks, 13, 6.7, true