tasks a-s

Task/Rock-paper-scissors/Go/rock-paper-scissors.go

@@ -0,0 +1,69 @@
+package main
+
+import (
+    "fmt"
+    "math/rand"
+    "strings"
+    "time"
+)
+
+const rps = "rps"
+
+var msg = []string{
+    "Rock breaks scissors",
+    "Paper covers rock",
+    "Scissors cut paper",
+}
+
+func main() {
+    rand.Seed(time.Now().UnixNano())
+    fmt.Println("Rock Paper Scissors")
+    fmt.Println("Enter r, p, or s as your play.  Anything else ends the game.")
+    fmt.Println("Running score shown as <your wins>:<my wins>")
+    var pi string // player input
+    var aScore, pScore int
+    sl := 3               // for output alignment
+    pcf := make([]int, 3) // pcf = player choice frequency
+    var plays int
+    aChoice := rand.Intn(3) // ai choice for first play is completely random
+    for {
+        // get player choice
+        fmt.Print("Play: ")
+        _, err := fmt.Scanln(&pi)  // lazy
+        if err != nil || len(pi) != 1 {
+            break
+        }
+        pChoice := strings.Index(rps, pi)
+        if pChoice < 0 {
+            break
+        }
+        pcf[pChoice]++
+        plays++
+
+        // show result of play
+        fmt.Printf("My play:%s%c.  ", strings.Repeat(" ", sl-2), rps[aChoice])
+        switch (aChoice - pChoice + 3) % 3 {
+        case 0:
+            fmt.Println("Tie.")
+        case 1:
+            fmt.Printf("%s.  My point.\n", msg[aChoice])
+            aScore++
+        case 2:
+            fmt.Printf("%s.  Your point.\n", msg[pChoice])
+            pScore++
+        }
+
+        // show score
+        sl, _ = fmt.Printf("%d:%d  ", pScore, aScore)
+
+        // compute ai choice for next play
+        switch rn := rand.Intn(plays); {
+        case rn < pcf[0]:
+            aChoice = 1
+        case rn < pcf[0]+pcf[1]:
+            aChoice = 2
+        default:
+            aChoice = 0
+        }
+    }
+}