def multi( x , y )
	a = 0
	x.length.times { |i|
		a += ( x[ i ] * y[ i ] )
	}
	return a
end

def add( x , y )
	z = []
	x.length.times { |i|
		z[ i ] = x[ i ] + y[ i ]
	}
	return z
end

def sub( x , y )
	z = []
	x.length.times { |i|
		z[ i ] = x[ i ] - y[ i ]
	}
	return z
end

a = [ 3 , 6 , 2 , 4 , 10 , 7 ]
b = [ 5 , 8 , 1 , 0 , 7 , 10 ]

c = add( a , b )
c.length.times { |i|
        printf( "%d " , c[ i ] )
}
printf( "\n" )

d = sub( a , b )
d.length.times { |i|
        printf( "%d " , d[ i ] )
}
printf( "\n" )

printf( "内積は%dです\n" , multi( c , d ) )