# 配列の要素の参照方法�@
a=[1,3,5,7,9]

a.length.times{ |i|
	print( a[ i ] , "\n" )
}

5.times{ |i|
	print( a[ i ] , "\n" )
}

(0..a.length-1).each{ |i|
	print( a[ i ] , "\n" )
}

# 配列の要素の参照方法�A
a=[1,3,5,7,9]
a.each{ |i|
	print( i , "\n" )
}

[1,3,5,7,9].each{ |i|
	print( i , "\n" )
}

# 配列の要素への代入
name = [ "A" , "B" , "C" , "D" , "E" ]
test = [ 85 , 60 , 5, 100 , 50 ]

name[ 3 ] = "d"
test[ 3 ] = 90

p name
p test

# 最後の要素への追加
name = [ "A" , "B" , "C" , "D" , "E" ]
test = [ 85 , 60 , 5, 100 , 50 ]

name[ name.length ] = "F"
test[ test.length ] = 70

p name
p test

# 平均点を求める�@
name = [ "A" , "B" , "C" , "D" , "E" ]
test = [ 85 , 60 , 5, 100 , 50 ]

sum = 0
test.length.times{ |i|
	sum += test[ i ]
}
print( "Average --> " , sum / test.length )

# 平均点を求める�A
name = [ "A" , "B" , "C" , "D" , "E" ]
test = [ 85 , 60 , 5, 100 , 50 ]

sum = 0
(0..test.length-1).each{ |i|
	sum += test[ i ]
}
print( "Average --> " , sum / test.length )

# 平均点を求める�B
name = [ "A" , "B" , "C" , "D" , "E" ]
test = [ 85 , 60 , 5, 100 , 50 ]

sum = 0
test.each{ |i|
	sum += i
}
print( "Average --> " , sum / test.length )

# 平均点未満の名前を出力
# coding: Windows-31J
name = [ "A" , "B" , "C" , "D" , "E" ]
test = [ 85 , 60 , 5, 100 , 50 ]
sum = 0
test.each{ |i|
	sum += i
}
average = sum / test.length

print( "平均点未満は...\n" )
test.length.times{ |i|
	if average > test[ i ] then
		print( name[ i ] , ": " , test[ i ] , "点\n" )
	end
}

# 最高点とその名前を出力
# coding: Windows-31J
name = [ "A" , "B" , "C" , "D" , "E" ]
test = [ 85 , 60 , 5, 100 , 50 ]

max = 0
test.length.times{ |i|
	if test[ max ] < test[ i ] then
		max = i
	end
}
print( "最高点は" , name[ max ] , " の " , test[ max ] , "点です\n" )

# 最低点とその名前を出力
# coding: Windows-31J
name = [ "A" , "B" , "C" , "D" , "E" ]
test = [ 85 , 60 , 5, 100 , 50 ]

min = 0
test.length.times{ |i|
	if test[ min ] > test[ i ] then
		min = i
	end
}
print( "最低点は" , name[ min ] , " の " , test[ min ] , "点です\n" )

# 検索�@
# coding: Windows-31J
name = [ "A" , "B" , "C" , "D" , "E" ]
test = [ 85 , 60 , 5, 100 , 50 ]

search = "B"
name.length.times{ |i|
	if name[ i ] == search then
		print( search , " の点は " , test[ i ] , "点です\n" )
		break
	end
}

# 検索�@（書き方に注意！）
# coding: Windows-31J
name = [ "A" , "B" , "C" , "D" , "E" ]
test = [ 85 , 60 , 5, 100 , 50 ]

search = "B"
name.length.times{ |i|
	if name[ i ] == search then
		break
	end
}
print( search , " の点は " , test[ i ] , "点です\n" )

# ローカル変数�@
10.times{ 
	a = 10
}
print( a , "\n" )

# ローカル変数�A
a = 0
10.times{ 
	a = 10
}
print( a , "\n" )

# グローバル変数
10.times{ 
	$a = 10
}
print( $a , "\n" )

# 検索�@（書き方に注意！）（続）
# coding: Windows-31J
name = [ "A" , "B" , "C" , "D" , "E" ]
test = [ 85 , 60 , 5, 100 , 50 ]
i=0
search = "B"
name.length.times{ |i|
	if name[ i ] == search then
		break
	end
}
print( search , " の点は " , test[ i ] , "点です\n" )

# 検索�@（書き方に注意！）（続）
x = 0
print( " x = " ,  x , "\n" )

10.times{ |x|
	print( " loop --> " , x , "\n" )
}

print( " x = " ,  x , "\n" )

# 検索�@（結論としては…）
# coding: Windows-31J
name = [ "A" , "B" , "C" , "D" , "E" ]
test = [ 85 , 60 , 5, 100 , 50 ]
result=0
search = "B"
name.length.times{ |i|
	if name[ i ] == search then
		result = i
		break
	end
}
print( search , " の点は " , test[ result ] , "点です\n" )

# 配列の初期化�@
sieve = Array.new(10).fill{ 1 }
p sieve

# 配列の初期化�A
sieve = Array.new(10).fill{ |i| i }
p sieve

# コマンドライン引数�C
print( ARGV[ 0 ] , "\n" )
print( ARGV[ 1 ] , "\n" )
print( ARGV[ 2 ] , "\n" )

# コマンドライン引数：プログラム
print( ARGV[0] + " + " + ARGV[1]+ " = " )
print( ARGV[0].to_i + ARGV[1].to_i )

print( "#{ARGV[0]} + #{ARGV[1]} = " )
print( ARGV[0].to_i + ARGV[1].to_i )

# 浮動小数点数にすると
print( ARGV[0] + " + " + ARGV[1]+ " = " )
print( ARGV[0].to_f + ARGV[1].to_f )

# 3個にすると
print( ARGV[0] + " + " + ARGV[1] + " + " + ARGV[2] + " = " )
print( ARGV[0].to_f + ARGV[1].to_f + ARGV[2].to_f )

# 検索�A
# coding: Windows-31J
name = [ "A" , "B" , "C" , "D" , "E" ]
test = [ 85 , 60 , 5, 100 , 50 ]

search = ARGV[ 0 ]
name.length.times{ |i|
	if name[ i ] == search then
		print( search , " の点は " , test[ i ] , "点です\n" )
		break
	end
}

# 検索�B
# coding: Windows-31J
name = [ "A" , "B" , "C" , "D" , "E" ]
test = [ 85 , 60 , 5, 100 , 50 ]

line = ARGV[ 0 ]
val = line.to_i
name.length.times{ |i|
	if test[ i ] == val then
		print( val , " 点は " , name[ i ] , "です\n" )
		break
	end
}

# 二重ループ
(0..9).each{ |x|
	(0..9).each{ |y|
		z = x*x + y*y
		print( " x = " , x , " y = " , y , ": z= " , z , "\n" )
	}
}

10.times{ |x|
	10.times{ |y|
		z = x*x + y*y
		print( " x = " , x , " y = " , y , ": z= " , z , "\n" )
	}
}

x = 0
while x < 10 do
	y= 0
	while y < 10 do
		z = x * x + y * y
		print( " x = " , x , " y = " , y , ": z= " , z , "\n" )
		y += 1
	end
	x += 1
end



# 二重ループの例�@
# coding: Windows-31J
(1..9).each{ |x|
	(1..9).each{ |y|
		printf( " %d×%d=%2d" , x , y , x * y  ) 
	}
	print( "\n" )
}

# 二重ループの例�A
(1..9).each{ |x|
	(1..9).each{ |y|
		if x == y then
			print( "1 " )
		else
			print( "0 " )
		end	
	}
	print( "\n" )
}

# 二重ループの例�B
(1..9).each{ |x|
	(1..9).each{ |y|
		if x == (10-y) then
			print( "1 " )
		else
			print( "0 " )
		end	
	}
	print( "\n" )
}

# 二重ループの例�C
(1..9).each { |i|
  (1..i).each { |j| 
	print( j ) 
　}
　print ( "\n" )
}

# 二重ループの例�D
(1..9).each { |i|
  (1..(10-i)).each{ |j| 
	print( j ) 
  }
  print ( "\n" )
}

# 二重ループの例�E
11.times { |i|
  d = Math.sqrt( 100 - i*i ).to_i
  (1..d).each{ 
	print( " " )
  }
  ((d+1)..10).each{
	 print( "*" )
  } 
  print( "\n" )
}

# 二重ループの例�F
11.times { |i|
  d = Math.sqrt( 400 - 4*i*i ).to_i
  (1..d).each{ 
	print( " " )
  }
  ((d+1)..20).each{ 
	print( "*" )
  } 
  print( "\n" )
}