Initial commit

11-if/04-short-if/03-scope/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+)
+
+func main() {
+	if a := os.Args; len(a) != 2 {
+
+		// only a is available here
+		fmt.Println("Give me a number.")
+
+		// no need to return on error
+		// return
+
+	} else if n, err := strconv.Atoi(a[1]); err != nil {
+
+		// a, n and err are available here
+		fmt.Printf("Cannot convert %q.\n", a[1])
+
+		// no need to return on error
+		// return
+
+	} else {
+		// all of the variables (names)
+		// are available here
+		fmt.Printf("%s * 2 is %d\n", a[1], n*2)
+	}
+
+	// a, n and err are not available here
+	// they belong to the if statement
+
+	// TRY:
+	// fmt.Println(a, n, err)
+}