number parsing example

src/xx-number-parsing.go

@@ -0,0 +1,34 @@
+                                               // Number parsing
+
+package main
+
+import (
+    "fmt"
+    "strconv"                                  // Package `strconv` provides number parsing.
+)
+
+func main() {
+	f, _ := strconv.ParseFloat("1.234", 64)    // `64` tells how many bits of precision to parse.
+	fmt.Println(f)                                
+
+	i, _ := strconv.ParseInt("123", 0, 64)     // `0` means infer the base from the string.
+	println(i)                                 // `64` requires that the result fit in 64 bits.
+
+	d, _ := strconv.ParseInt("0x1b3e", 0, 64)  // `ParseInt` will recognize hex-formatted numbers.
+	println(d)
+
+	k, _ := strconv.Atoi("456")                // `Atoi` is a convenienice function for `int` parsing.
+	println(k)
+	
+	_, e := strconv.Atoi("wat")                // Parse functions return an error on bad input.
+	fmt.Println(e)
+}
+
+/*
+$ go run xx-number-parsing.go
+1.234
+123
+6974
+456
+strconv.ParseInt: parsing "wat": invalid syntax
+*/

src/xx-parse.go

@@ -1,20 +0,0 @@
-package main
-
-import ("fmt"; "strconv")
-
-func main() {
-	b, _ := strconv.ParseBool("true")
-	fmt.Println(b)
-
-	f, _ := strconv.ParseFloat("1.234", 64)
-	fmt.Println(f)
-
-	i, _ := strconv.ParseInt("123", 0, 64)
-	fmt.Println(i)
-
-	d, _ := strconv.ParseInt("0x1b3e", 0, 64)
-	fmt.Println(d)
-
-	k, _ := strconv.Atoi("456")
-	fmt.Println(k)
-}