fmt: add example for Fscanln

Updates golang/go#27376.

Change-Id: I9f33233f1aafa10941a63fcb4e49d351ea7ee246
Reviewed-on: https://go-review.googlesource.com/132675
Reviewed-by: Kevin Burke <kev@inburke.com>
Run-TryBot: Kevin Burke <kev@inburke.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

diff --git a/src/fmt/example_test.go b/src/fmt/example_test.go
index 9b72d7a38376cf16eaa1a2261ee3d2fd24f6719b..1479b761b6e0f03422a3dad79f7977292ad9db30 100644 (file)
--- a/src/fmt/example_test.go
+++ b/src/fmt/example_test.go
@@ -6,6 +6,7 @@ package fmt_test
 
 import (
        "fmt"
+       "io"
        "os"
        "strings"
 )
@@ -77,3 +78,25 @@ func ExampleFprintln() {
        // there are 99 gophers
        // 21
 }
+
+func ExampleFscanln() {
+       s := `dmr 1771 1.61803398875
+       ken 271828 3.14159`
+       r := strings.NewReader(s)
+       var a string
+       var b int
+       var c float64
+       for {
+               n, err := fmt.Fscanln(r, &a, &b, &c)
+               if err == io.EOF {
+                       break
+               }
+               if err != nil {
+                       panic(err)
+               }
+               fmt.Printf("%d: %s, %d, %f\n", n, a, b, c)
+       }
+       // Output:
+       // 3: dmr, 1771, 1.618034
+       // 3: ken, 271828, 3.141590
+}