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// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package fmt_test
import (
// Animal has a Name and an Age to represent an animal.
type Animal struct {
Name string
Age uint
// String makes Animal satisfy the Stringer interface.
func (a Animal) String() string {
return fmt.Sprintf("%v (%d)", a.Name, a.Age)
func ExampleStringer() {
a := Animal{
Name: "Gopher",
Age: 2,
// Output: Gopher (2)