Penney's game: Difference between revisions

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@@ Line 3,586: / Line 3,586: @@
 <lang sh>#!/bin/bash
 main() {
-  echo "Penney's Game"
+  printf $'Penney\'s Game\n\n'
-  echo -n "Flipping to see who goes first ... "
+  printf 'Flipping to see who goes first ... '
   if [[ $(flip) == H ]]; then
-    echo "I do."
+    printf 'I do.\n'
     p2=$(choose_sequence)
-    echo "I choose: $p2"
+    printf 'I choose: %s\n' "$p2"
   else
-    echo "You do."
+    printf 'You do.\n'
   fi
   while true; do
-    echo "Enter your three-flip sequence:"
+    read -p 'Enter your three-flip sequence: ' p1
-    read p1
+    p1=$(tr a-z A-Z <<<"$p1")
     case "$p1" in
-     "$p2") echo "Sequence must be different from mine";;
+     "$p2") printf 'Sequence must be different from mine\n';;
-     [hHTt][hHtT][hHtT]) break;;
+     [HT][HT][HT]) break;;
-     *) echo "Sequence must be three H's or T's";;
+     *) printf $'Sequence must be three H\'s or T\'s\n';;
     esac
   done
-  p1=$(tr a-z A-Z <<<"$p1")
   if [ -z "$p2" ]; then
     p2=$(choose_sequence "$p1")
-    echo "I choose: $p2"
+    printf 'I choose: %s\n' "$p2"
   fi
+  printf '\nHere we go.  %s, you win; %s, I win.\n' "$p1" "$p2"
-  echo
+  printf 'Flips:'
-  echo "Here we go.  $p1, you win; $p2, I win."
-  flips=
+  flips=
   while true; do
     flip=$(flip)
-    echo -n $flip
+    printf ' %s' "$flip"
     flips+=$flip
-    while (( ${#flips} > 3 )); do
-      flips="${flips#?}"
-    done
     case "$flips" in
-      *$p1) echo $'\nYou win!'; exit 0;;
+      *$p1) printf $'\nYou win!\n'; exit 0;;
-      *$p2) echo $'\nI win!'; exit 1;;
+      *$p2) printf $'\nI win!\n'; exit 1;;
     esac
   done
@@ Line 3,635: / Line 3,631: @@
   if (( $# )); then
     case "$1" in
-      ?Hh?) result=T;;
+      ?[Hh]?) result=T;;
       *) result=H;;
     esac
@@ Line 3,642: / Line 3,638: @@
     result=$(flip)$(flip)$(flip)
   fi
-  echo "$result"
+  printf '%s\n' "$result"
 }
 flip() {
   if (( RANDOM % 2 )); then
-    echo H
+    printf '%s\n' H
   else
-    echo T
+    printf '%s\n' T
   fi
 }
-main "$@"</lang>
+main "$@"
+</lang>
 {{Output}}
@@ Line 3,668: / Line 3,665: @@
 Human first:
-<pre>penney
+<pre>Penney's Game
-Penney's Game
+Flipping to see who goes first ... I do.
+I choose: HHH
+Enter your three-flip sequence: THH
+Here we go.  THH, you win; HHH, I win.
+Flips: H H T H H
+You win!</pre>
+Human first:
+<pre>Penney's Game
 Flipping to see who goes first ... You do.
-Enter your three-flip sequence:
+Enter your three-flip sequence: THH
+I choose: TTH
-HTH
-I choose: HHT
-Here we go.  HTH, you win; HHT, I win.
+Here we go.  THH, you win; TTH, I win.
+Flips: H H T T T H
-HHHT
 I win!</pre>