feat: init & playaround

go-by-example/constants/constants.go

@@ -0,0 +1,22 @@
+package main
+
+import (
+	"fmt"
+	"math"
+)
+
+const s string = "constant"
+
+func main() {
+	fmt.Println(s)
+
+	const n = 500000000
+
+	const d = 3e20 / n
+
+	fmt.Println(d)
+
+	fmt.Println(int64(d))
+
+	fmt.Println(math.Sin(n))
+}