# 二重ループ（復習）

4.times{ |i|
    3.times{ |j|
		print( i , " + " , j , " = " , i + j , "\n" )
    }
}

# 二次元配列の要素の参照�@

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

4.times{ |i|
    3.times{ |j|
	  print( " a[ " , i , " ][ " , j , " ] = " , 
		a[ i ][ j ] , "\n" )
    }
}	

# 二次元配列の要素の参照�@'

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

3.times{ |i|
    4.times{ |j|
	  print( " a[ " , j , " ][ " , i , " ] = " , 
		a[ j ][ i ] , "\n" )
    }
}	

# 二次元配列の要素の参照�A

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

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

# 二次元配列の要素の参照�B
a=[
    [ 1 , 2 , 3 ] ,
    [ 4 , 5 , 6 ] ,
    [ 7 , 8 , 9 ] ,
    [ 10 , 11 , 12 ]
]

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

# 二次元配列の要素の参照�C''

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

a.each{ |i|
    p  i
    i.each{ |j|
    	    print( j , "\n" )
    }
}

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

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

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

a.each{ |i|
    p  i
    p  i.length
}	

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

# 二次元配列の要素の参照�D'''
a.each{ |i|
    i.length.times{ |j|
	　　print( i[ j ] , "\n" )
    }
}	

a = [
   [ 1 ],
   [ 2, 3 ],
   [ 4, 5, 6],
   [ 7, 8, 9, 10]
]

a.each{ |i|
    i.each{ |j|
	　　print( j , "\n" )
    }
}	

# 二次元配列の要素への代入�@
a=[]

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

count = 1
3.times{ |i|
    3.times{ |j|
	  a[ i ][ j ] = count
	  count += 1
    }
}	

p a

# 二次元配列の要素への代入�@'

a=[]

3.times{ |i|
  a[ i ] = Array.new( 3 )
}

count = 1
3.times{ |i|
    3.times{ |j|
	  a[ i ][ j ] = count
	  count += 1
    }
}	
p a

a=[]

count = 1
3.times{ |i|
    a[ i ] = []
    3.times{ |j|
	  a[ i ][ j ] = count
	  count += 1
    }
}	
p a

# 二次元配列の要素への代入�@''
a=[]

count = 1
3.times{ |i|
    a[ i ] = []
    3.times{ |j|
	  a[ i ][ j ] = count
	  count += 1
    }
}	

p a

# 二次元配列の要素への代入�A
a=[]

(0..2).each{ |i|
    a[ i ] = []
    (0..2).each{ |j|
	  a[ i ][ j ] = rand( 10 )
    }
}	

p a

# 二次元配列の要素への代入�A'
a=[]

for i in (0..2) do
    a[ i ] = []
    for j in (0..2) do
	  a[ i ][ j ] = rand( 10 )
    end
end

p a

# 二次元配列の要素への代入�B
a=[1,2,3]

b=[]
3.times{ |i|
    b[ i ] = []
    3.times{ |j|
	   b[ i ][ j ] = a[ j ]  
    }
}	

p b

# 二次元配列の要素への代入�B'
a=[1,2,3]

b=[]
3.times{ |i|
    b[ i ] = []
    3.times{ |j|
	   b[ i ][ j ] = a[ i ]  
    }
}	

p b

# 二次元配列の要素への代入�C
a=[1,2,3]

b=[]
3.times{ |i|
    b[ i ] = []
    b[ i ] = a
}	

p b

# 二次元配列の要素への代入�C'
a=[1,2,3]

b=[]
3.times{ |i|
    b[ i ] = []
    b[ i ] = a
}	

p b

a[0]=100
p b

# 二次元配列の要素への代入�D
a=[]
3.times{ |i|
    a[ i ] = []
    3.times{ |j|
	a[ i ][ j ] = gets.chomp.to_i
   }
}

p a

# 二次元配列のコピー�@
a=[
    [ 1 , 2 , 3 ] ,
    [ 4 , 5 , 6 ] ,
    [ 7 , 8 , 9 ] ,
    [ 10 , 11 , 12 ]
]

b = []
a.length.times{ |i|
    b[ i ] = []
    a[ i ].length.times{ |j|
	　　b[ i ][ j ] = a[ i ][ j ]
    }
}	

p b

# 二次元配列のコピー�@'
a=[
    [ 1 , 2 , 3 ] ,
    [ 4 , 5 , 6 ] ,
    [ 7 , 8 , 9 ] ,
    [ 10 , 11 , 12 ]
]

b = []
a.length.times{ |i|
    b[ i ] = []
    b[ i ] = a[ i ]
}	

p b

# 各人の平均点を求めるプログラム�@
p = [
     [1,70,60,83],
     [2,43,49,76],
     [3,59,79,43],
     [4,67,74,83]
]

(0..3).each{ |i|
  sum = 0
  (1..3).each{ |j| 
	sum += p[i][j] 
  }
  ave = sum / 3 
  puts( "出席番号 #{p[i][0]} の人の平均点は #{ave} です" ) 
}

# 各人の平均点を求めるプログラム�A'
p = [
     [1,70,60,83],
     [2,43,49,76],
     [3,59,79,43],
     [4,67,74,83]
]

(0..p.length-1).each{ |i|
  sum = 0
  (1..p[i].length-1).each{ |j| 
	sum += p[i][j] 
  }
  ave = sum / ( p[i].length-1 ) 
  puts( "出席番号 #{p[i][0]} の人の平均点は #{ave} です" ) 
}

# 各人の平均点を求めるプログラム�B
p = [
     [1,70,60,83],
     [2,43,49,76],
     [3,59,79,43],
     [4,67,74,83],
]

p.each{ |a|
    sum = 0
    (1..a.length-1).each{ |i|
	sum += a[ i ]
     }
     ave = sum / ( a.length-1 ) 
     puts( "出席番号 #{a[0]} の人の平均点は #{ave} です" ) 
}

# 各人の平均点を求めるプログラム�B'
p = [
     [1,70,60,83],
     [2,43,49,76],
     [3,59,79,43],
     [4,67,74,83],
]

p.each{ |a|
    sum = 0
    count = 0
    a.each{ |i|
	if count > 0 then
		sum += i
	end
        count += 1
     }
     ave = sum / ( a.length-1 ) 
     puts( "出席番号 #{a[0]} の人の平均点は #{ave} です" ) 
}

# 各人の平均点を求めるプログラム�C
p = [
     [1,70,60,83],
     [2,43,49,76],
     [3,59,79,43],
     [4,67,74,83]
]

ave =[]
(0..p.length-1).each{ |i|
  sum = 0
  (1..p[i].length-1).each{ |j| 
	sum += p[i][j] 
  }
  ave[i] = sum / ( p[i].length-1 ) 
}

(0..p.length-1).each{ |i|
  puts( "出席番号 #{p[i][0]} の人の平均点は #{ave[i]} です" ) 
}