def min_max( x )
	array = []
	array[ 0 ] = x[ 0 ]
	array[ 1 ] = x[ 0 ]
	(1..x.length-1).each { |i|
		if array[ 0 ] > x[ i ] then
			array[ 0 ] = x[ i ]
		elsif array[ 1 ] < x[ i ] then
			array[ 1 ] = x[ i ]
		end
	}
	return array
end

a = [ 3 , 5 , 1 , 4 , 10 , 7 ]
result = min_max( a )
printf( "最小値は%dで，最大値は%dです\n" , result[ 0 ] , result[ 1 ] )