# 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( "平均点 --> " , 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( "平均点 --> " , 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( "平均点 --> " , sum / test.length )


# 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" )


# 二次元配列の宣言�@

a=[
    [ 1 , 2 , 3 ] ,
    [ 4 , 5 , 6 ] ,
    [ 7 , 8 , 9 ]
]
p a

# 二次元配列の要素の参照�A

a=[
    [ 1 , 2 , 3 ] ,
    [ 4 , 5 , 6 ] ,
    [ 7 , 8 , 9 ]
]

p a[ 0 ][ 0 ]
p a[ 0 ][ 1 ]
p a[ 0 ][ 2 ]

p a[ 1 ][ 0 ]
p a[ 1 ][ 1 ]
p a[ 1 ][ 2 ]

p a[ 2 ][ 0 ]
p a[ 2 ][ 1 ]
p a[ 2 ][ 2 ]

# 二次元配列の要素の参照�C

a=[
    [ 1 , 2 , 3 ] ,
    [ 4 , 5 , 6 ] ,
    [ 7 , 8 , 9 ]
]

p a[ 0 ]
p a[ 1 ]
p a[ 2 ]

# 二次元配列の要素の参照�D

a=[
    [ 1 , 2 , 3 ] ,
    [ 4 , 5 , 6 ] ,
    [ 7 , 8 , 9 ]
]

p a.length
p a[ 0 ].length
p a[ 1 ].length
p a[ 2 ].length

# 二次元配列の要素の参照�D'
a=[
    [ 1 ] ,
    [ 4 , 5 ] ,
    [ 7 , 8 , 9 ]
]

p a.length
p a[ 0 ].length
p a[ 1 ].length
p a[ 2 ].length

# 二次元配列の要素の参照�D''
a=[
    [ 1 ] ,
    [ 4 , 5 ] ,
    [ 7 , 8 , 9 ]
]

p a[ 0 ][ 0 ]
p a[ 0 ][ 1 ]
p a[ 0 ][ 2 ]

p a[ 1 ][ 0 ]
p a[ 1 ][ 1 ]
p a[ 1 ][ 2 ]

p a[ 2 ][ 0 ]
p a[ 2 ][ 1 ]
p a[ 2 ][ 2 ]

# 二次元配列の要素の参照�D'''
a=[
    [ 1 , 2 , 3 , 4] ,
    [ 5 , 6 , 7 ] ,
    [ 8 , 9 ] ,
    [ 10 ]
]

p a.length
p a[ 0 ].length
p a[ 1 ].length
p a[ 2 ].length
p a[ 3 ].length


# 二次元配列の要素への代入

a = Array.new( 4 )

a[ 0 ] = Array.new( 3 )
a[ 1 ] = Array.new( 3 )
a[ 2 ] = Array.new( 3 )
a[ 3 ] = Array.new( 3 )

a[ 0 ][ 0 ] = 1
a[ 0 ][ 1 ] = 2
a[ 0 ][ 2 ] = 3
a[ 1 ][ 0 ] = 4
a[ 1 ][ 1 ] = 5
a[ 1 ][ 2 ] = 6
a[ 2 ][ 0 ] = 7
a[ 2 ][ 1 ] = 8
a[ 2 ][ 2 ] = 9
a[ 3 ][ 0 ] = 10
a[ 3 ][ 1 ] = 11
a[ 3 ][ 2 ] = 12

p a

# 二次元配列の宣言�B
a = []

a[ 0 ] = []
a[ 0 ][ 0 ] = 1
a[ 0 ][ 1 ] = 2
a[ 0 ][ 2 ] = 3

a[ 1 ] = []
a[ 1 ][ 0 ] = 4
a[ 1 ][ 1 ] = 5
a[ 1 ][ 2 ] = 6

a[ 2 ] = []
a[ 2 ][ 0 ] = 7
a[ 2 ][ 1 ] = 8
a[ 2 ][ 2 ] = 9

a[ 3 ] = []
a[ 3 ][ 0 ] = 10
a[ 3 ][ 1 ] = 11
a[ 3 ][ 2 ] = 12

p a

# 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�@
(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" )
}

(1..9).each{ |x|
	(1..9).each{ |y|
		if x % 2 == 0 and y % 2 == 0 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�B'
(1..9).each{ |x|
	(1..9).each{ |y|
		if x == y or 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" )
}