LRTHW笔记六

源码ex6-2.rb ：

types_of_people = 10
x = "There are #{types_of_people} types of people."    
binary = "binary"
do_not = "don't"
y = "Those who know '#{binary}' and those who #{do_not}."
z = 'Those who know "#{binary}" and those who #{do_not}.'
puts x
puts y

puts "I said: #{x}"
puts "I also said: '#{y}'."
puts "I also said: '#{z}'."

结果是：

[ufindme@ufindme rubywork]$ ruby  ex6-2.rb 
There are 10 types of people.
Those who know 'binary' and those who don't.
I said: There are 10 types of people.
I also said: 'Those who know 'binary' and those who don't.'.
I also said: 'Those who know "#{binary}" and those who #{do_not}.'.

这里注意一点：

　　双引号里面的单引号是原样输出，而单引号里面的双引号也是原样输出。

　　双引号里面的变量的输出时，变量用实际的值代替后输出显示。

　　单引号是不管引号里面的是什么，都源码输出，也没有替代。