Stringer Interface क्या है

// Every Go file belongs to a package; main builds an executable
package main

// Import the fmt package
import "fmt"

// Define a struct type named Point
type Point struct {
	X, Y int
}

// Define the method String on type Point
func (p Point) String() string {
	// Sprintf builds a formatted string instead of printing it
	return fmt.Sprintf("(%d, %d)", p.X, p.Y)
}

// main is where the program starts running
func main() {
	// Short declaration: create p and infer the type
	p := Point{3, 4}
	// Print the values followed by a newline
	fmt.Println(p)
}

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// Every Go file belongs to a package; main builds an executable
package main

// Import the fmt package
import "fmt"

type Status int

const (
	Active Status = iota
	Inactive
)

// Define the method String on type Status
func (s Status) String() string {
	// Check whether s == Active
	if s == Active {
		// Send "Active" back to the caller
		return "Active"
	}
	// Send "Inactive" back to the caller
	return "Inactive"
}

// main is where the program starts running
func main() {
	// Print the values followed by a newline
	fmt.Println(Active)
	fmt.Println(Inactive)
}

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package main

import "fmt"

type Temp struct {
	Celsius float64
}

func (t Temp) String() string {
	return fmt.Sprintf("%.1f°C", t.Celsius) // uses the field, not t itself
}

func main() {
	fmt.Println(Temp{Celsius: 21.5})
}

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