必须要导入 complex 才能用这种字面量么？ 导入一个模块能改变词法很不理解……

#1 楼 @ekim_sgra 哦，不用导入也可以

@luikore 这样才赞嘛！

ruby 好强大

• Added integer and float literals: r, i, and ri.
  • "42r" and "3.14r" are evaluated as Rational(42, 1) and 3.14.rationalize, respectively. But exponential form with r suffix like "6.022e+23r" is not accepted because it is misleading.
  • "42i" and "3.14i" are evaluated as Complex(0, 42) and Complex(0, 3.14), respectively.
  • "42ri" and "3.14ri" are evaluated as Complex(0, 42r) and Complex(0, 3.14r), respectively.

Ruby2.0 中 Complex 和 Rational 已经在 core 了，但是 Decimal 还在 stand lib。

1% 的程序需要用到复数吧？

额？为何不设计成3 + 4i？这个才是真正的复数写法吧？

#8 楼 @iBachue 也可以啊，r 可以看作没做操作，只是 lift 到 rational 而已

Cant wait for Ruby 2.1

'3+4i'.to_c