Example of Fscan, Fscanf, and Fscanln from FMT Package
Fscan scans text read from r, storing successive space-separated values into successive arguments.
Fscanf scans text read from r, storing successive space-separated values into successive arguments as determined by the format.
Fscanln is similar to Fscan, but stops scanning at a newline and after the final item there must be a newline or EOF.
To execute this program need to create a text file with name testfile.txt and content given in below program comment section.
Example
/* testfile.txt content:
255 5.5 true Australia
200 9.3 false Germany
Paris 5 true 5.5
*/
package main
import (
"fmt"
"os"
)
var (
L int32
M float32
N bool
O string
)
func main() {
file, err := os.Open("testfile.txt")
if err != nil {
panic(err)
}
defer file.Close()
fmt.Fscan(file, &L, &M, &N, &O)
fmt.Printf("\nL M N O: %v %v %v %v", L,M,N,O)
fmt.Fscanln(file, &L, &M, &N, &O)
fmt.Printf("\nL M N O: %v %v %v %v", L,M,N,O)
fmt.Fscanf(file, "%s %d %t %f",&O, &L, &N, &M)
fmt.Printf("\nO L N M: %v %v %v %v", O,L,N,M)
}
Output
L M N O: 255 5.5 true Australia
L M N O: 200 9.3 false Germany
O L N M: Paris 5 true 5.5