good good study, day day up!

vendor/gopl.io/ch2/tempconv0/tempconv_test.go

@@ -0,0 +1,45 @@
+// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+
+package tempconv
+
+import "fmt"
+
+func Example_one() {
+	{
+		//!+arith
+		fmt.Printf("%g\n", BoilingC-FreezingC) // "100" °C
+		boilingF := CToF(BoilingC)
+		fmt.Printf("%g\n", boilingF-CToF(FreezingC)) // "180" °F
+		//!-arith
+	}
+	/*
+		//!+arith
+		fmt.Printf("%g\n", boilingF-FreezingC)       // compile error: type mismatch
+		//!-arith
+	*/
+
+	// Output:
+	// 100
+	// 180
+}
+
+func Example_two() {
+	//!+printf
+	c := FToC(212.0)
+	fmt.Println(c.String()) // "100°C"
+	fmt.Printf("%v\n", c)   // "100°C"; no need to call String explicitly
+	fmt.Printf("%s\n", c)   // "100°C"
+	fmt.Println(c)          // "100°C"
+	fmt.Printf("%g\n", c)   // "100"; does not call String
+	fmt.Println(float64(c)) // "100"; does not call String
+	//!-printf
+
+	// Output:
+	// 100°C
+	// 100°C
+	// 100°C
+	// 100°C
+	// 100
+	// 100
+}