added 42-gunner for perl

42_Gunner/perl/gunner.pl

@@ -0,0 +1,81 @@
+#!/usr/bin/perl
+
+# Gunner program in Perl
+#   Required extensive restructuring to remove all of the GOTO's.
+# Translated by Kevin Brannen (kbrannen)
+
+use strict;
+use warnings;
+
+# globals
+my $Max_range = int(40000*rand(1)+20000);
+my $Total_shots = 0;
+my $Games = 0;
+
+print "\n";
+print " " x 30, "GUNNER\n";
+print " " x 15, "CREATIVE COMPUTING  MORRISTOWN, NEW JERSEY\n\n\n";
+
+print "YOU ARE THE OFFICER-IN-CHARGE, GIVING ORDERS TO A GUN\n";
+print "CREW, TELLING THEM THE DEGREES OF ELEVATION YOU ESTIMATE\n";
+print "WILL PLACE A PROJECTILE ON TARGET.  A HIT WITHIN 100 YARDS\n";
+print "OF THE TARGET WILL DESTROY IT.\n\n";
+print "MAXIMUM RANGE OF YOUR GUN IS $Max_range YARDS.\n\n";
+
+GAME: while (1)
+{
+    my $target_dist = int($Max_range * (.1 + .8 * rand(1)));
+    my $shots = 0;
+    print "DISTANCE TO THE TARGET IS $target_dist YARDS.\n\n";
+    while (1)
+    {
+        my $elevation = get_elevation(); # in degrees
+        $shots++;
+        my $dist = int($target_dist - ($Max_range * sin(2 * $elevation / 57.3)));
+        if (abs($dist) < 100)
+        {
+            print "*** TARGET DESTROYED ***  $shots ROUNDS OF AMMUNITION EXPENDED.\n";
+            $Total_shots += $shots;
+            if ($Games++ == 4)
+            {
+                print "\n\nTOTAL ROUNDS EXPENDED WERE: $Total_shots\n";
+                if ($Total_shots > 18) { print "BETTER GO BACK TO FORT SILL FOR REFRESHER TRAINING!\n"; }
+                else                   { print "NICE SHOOTING !!\n"; }
+                last;
+            }
+            print "\nTHE FORWARD OBSERVER HAS SIGHTED MORE ENEMY ACTIVITY...\n";
+            next GAME;
+        }
+        if ($dist > 100) { print "SHORT OF TARGET BY ", abs($dist)," YARDS.\n"; }
+        else             { print "OVER TARGET BY ", abs($dist), " YARDS.\n"; }
+
+        if ($shots >= 5)
+        {
+            print "\nBOOM !!!!   YOU HAVE JUST BEEN DESTROYED BY THE ENEMY.\n\n\n\n"; 
+            print "BETTER GO BACK TO FORT SILL FOR REFRESHER TRAINING!\n";
+            last;
+        }
+    }
+
+    print "\nTRY AGAIN (Y OR N): ";
+    chomp(my $ans=uc(<>));
+    if ($ans ne "Y") { last; }
+    else             { $Games = 0; $Total_shots = 0; }
+}
+
+print "\nOK.  RETURN TO BASE CAMP.\n";
+
+####################################
+
+sub get_elevation
+{
+    my $elevation;
+    while (1)
+    {
+        print "\nELEVATION: ";
+        chomp($elevation = <>);
+        if    ($elevation > 89) { print "MAXIMUM ELEVATION IS 89 DEGREES.\n"; }
+        elsif ($elevation < 1)  { print "MINIMUM ELEVATION IS ONE DEGREE.\n"; }
+        else                    { return $elevation; }
+    }
+}