fmt.Fscanln() 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.Fscanln() function in Go language scans the specified text, read from r and then stores successive space-separated values into successive arguments. This function stops scanning at a newline and after the final item, there must be a newline or EOF. 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 Fscanln(r io.Reader, a ...interface{}) (n int, err error)
Parameters: This function accepts two parameters which are illustrated below:
- r io.Reader: This parameter contains the scanned specified texts.
- a …interface{}: These parameters are accepting each specified elements.
Returns: It returns the number of items successfully scanned.
Example 1:
// Golang program to illustrate the usage of // fmt.Fscanln() function // Including the main package package main // Importing fmt, io and strings import ( "fmt" "io" "strings" ) // Calling main func main() { // Declaring list of strings, // integers and float value s := `gfg 9` // Calling NewReader() function for // reading each elements of the list // and then it place it into "r" r := strings.NewReader(s) // Declaring different types of variables var a string var b int for { // Calling Fscanln() function n, err := fmt.Fscanln(r, &a, &b) // Checking returned error is // end of the line (EOF) or not if err == io.EOF { break } // Checking if there is any error if err != nil { panic(err) } // Printing the number of items successfully // scanned and each elements too fmt.Printf( "%d: %s, %d" , n, a, b) } } |
Output:
2: gfg, 9
Example 2:
// Golang program to illustrate the usage of // fmt.Fscanln() function // Including the main package package main // Importing fmt, io and strings import ( "fmt" "io" "strings" ) // Calling main func main() { // Declaring list of strings, // integers and float value s := `gfg 9 true 5.78` // Calling NewReader() function for // reading each elements of the list // and then it place it into "r" r := strings.NewReader(s) // Declaring different types of variables var a string var b int var c bool var d float32 for { // Calling Fscanln() function n, err := fmt.Fscanln(r, &a, &b, &c, &d) // Checking returned error is // end of the line (EOF) or not if err == io.EOF { break } // Checking if there is any error if err != nil { panic(err) } // Printing the number of items successfully // scanned and each elements too fmt.Printf( "%d: %s, %d, %t, %g" , n, a, b, c, d) } } |
Output:
4: gfg, 9, true, 5.78
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