good good study, day day up!

vendor/gopl.io/ch2/ftoc/main.go

@@ -0,0 +1,22 @@
+// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+
+// See page 29.
+//!+
+
+// Ftoc prints two Fahrenheit-to-Celsius conversions.
+package main
+
+import "fmt"
+
+func main() {
+	const freezingF, boilingF = 32.0, 212.0
+	fmt.Printf("%g°F = %g°C\n", freezingF, fToC(freezingF)) // "32°F = 0°C"
+	fmt.Printf("%g°F = %g°C\n", boilingF, fToC(boilingF))   // "212°F = 100°C"
+}
+
+func fToC(f float64) float64 {
+	return (f - 32) * 5 / 9
+}
+
+//!-