#!/bin/bash

# $RANDOM Àº ºÒ¸± ¶§¸¶´Ù ´Ù¸¥ ¹«ÀÛÀ§ Á¤¼ö °ªÀ» ¸®ÅÏÇÕ´Ï´Ù.
# ¸íĪ»óÀÇ ¹üÀ§(nominal range): 0 - 32767(16 ºñÆ® ¾çÀÇ Á¤¼ö).

MAXCOUNT=10
count=1

echo
echo "$MAXCOUNT °³ÀÇ ·£´ýÇÑ ¼ýÀÚ:"
echo "-----------------"
while [ "$count" -le $MAXCOUNT ]      # 10 ($MAXCOUNT) °³ÀÇ ·£´ý Á¤¼ö ¹ß»ý.
do
  number=$RANDOM
  echo $number
  let "count += 1"  # Ä«¿îÅÍ Áõ°¡.
done
echo "-----------------"

# ¾î¶² ¹üÀ§ÀÇ ·£´ý °ªÀÌ ÇÊ¿äÇÏ´Ù¸é '³ª¸ÓÁö(modulo)' ¿¬»êÀÚ¸¦ ¾²¸é,
# ¾î¶² ¼ö¸¦ ³ª´« ³ª¸ÓÁö °ªÀ» ¸®ÅÏÇØ ÁÝ´Ï´Ù.

RANGE=500

echo

number=$RANDOM
let "number %= $RANGE"
echo "$RANGE º¸´Ù ÀÛÀº ·£´ýÇÑ ¼ýÀÚ  ---  $number"

echo

# ¾î¶² °ªº¸´Ù Å« ·£´ýÇÑ Á¤¼ö°¡ ÇÊ¿äÇÏ´Ù¸é 
# ±× °ªº¸´Ù ÀÛÀº ¼ö´Â ¹«½ÃÇÏ´Â Å×½ºÆ® ¹®À» °É¸é µË´Ï´Ù.

FLOOR=200

number=0   # ÃʱâÈ­
while [ "$number" -le $FLOOR ]
do
  number=$RANDOM
done
echo "$FLOOR º¸´Ù Å« ·£´ýÇÑ ¼ýÀÚ  ---  $number"
echo


# »óÇÑ°ª°ú ÇÏÇÑ°ª »çÀÌÀÇ ¼ö°¡ ÇÊ¿äÇÏ´Ù¸é À§ÀÇ µÎ Å×Å©´ÐÀ» °°ÀÌ ¾²¸é µË´Ï´Ù.
number=0   # ÃʱâÈ­
while [ "$number" -le $FLOOR ]
do
  number=$RANDOM
  let "number %= $RANGE"  # $number °¡ $RANGE ¾È¿¡ µé¾î¿À°Ô.
done
echo "$FLOOR ¿Í $RANGE »çÀÌÀÇ ·£´ýÇÑ ¼ýÀÚ  ---  $number"
echo


# "Âü"À̳ª "°ÅÁþ"Áß¿¡ Çϳª¸¦ °í¸£µµ·Ï ÇÒ ¼öµµ ÀÖ½À´Ï´Ù.
BINARY=2
number=$RANDOM
T=1

let "number %= $BINARY"
# let "number >>= 14"    ´õ ÁÁÀº ºÐÆ÷ÀÇ ·£´ý°ªÀ» ÁÝ´Ï´Ù.
# (¸¶Áö¸· µÎ ºñÆ®¸¦ Á¦¿ÜÇÏ°í ¸ðµÎ ¿À¸¥ÂÊÀ¸·Î ½¬ÇÁÆ® ½ÃÅ´).
if [ "$number" -eq $T ]
then
  echo "TRUE"
else
  echo "FALSE"
fi  

echo


# ÁÖ»çÀ§ ´øÁö±â¸¦ Èä³»³» º¼±î¿ä?
SPOTS=7   # 7 ÀÇ ³ª¸ÓÁö(modulo)´Â 0 - 6.
DICE=2
ZERO=0
die1=0
die2=0

# Á¤È®ÇÑ È®·üÀ» À§Çؼ­ µÎ °³ÀÇ ÁÖ»çÀ§¸¦ µû·Î ´øÁý½Ã´Ù.

  while [ "$die1" -eq $ZERO ]     # ÁÖ»çÀ§¿¡ 0Àº ¾øÁÒ.
  do
    let "die1 = $RANDOM % $SPOTS" # ù¹ø° ÁÖ»çÀ§¸¦ ±¼¸®°í.
  done  

  while [ "$die2" -eq $ZERO ]
  do
    let "die2 = $RANDOM % $SPOTS" # µÎ¹ø°¸¦ ±¼¸®¸é.
  done  

let "throw = $die1 + $die2"
echo "µÎ ÁÖ»çÀ§¸¦ ´øÁø °á°ú = $throw"
echo


exit 0