Added go mod, imply one die in absence of count

README.md

@@ -1,3 +1,13 @@
 # roll
 
-A simple die roller
+A simple die roller
+
+Example Usage:
+Just roll a single d20
+
+`roll`
+
+
+Roll 5 d20 7 times
+
+`roll 5d20x7`

main.go

@@ -20,6 +20,9 @@ func main() {
 			parm = os.Args[1] + "d" + os.Args[2]
 		}
 	}
+	if strings.HasPrefix(parm, "d") {
+		parm = "1" + parm
+	}
 
 	r = rand.New(rand.NewSource(time.Now().UnixNano()))
 	num, sides, times := parseParm(parm)
@@ -58,7 +61,7 @@ func parseParm(p string) (int, int, int) {
 func roll(num, sides int) int {
 	ret := 0
 	for ; num > 0; num-- {
-		ret += r.Intn(sides)
+		ret += r.Intn(sides) + 1
 	}
 	return ret
 }