https://ruby-china.org/Thomas en-us <p>class Point attr_accessor:x,:y protected :x=,:y=</p> <p>def initialize(x=0.0,y=0.0) <a href="/x" class="user-mention" title="@x"><i>@</i>x</a>,<a href="/y" class="user-mention" title="@y"><i>@</i>y</a> = x,y end</p> <p>def swap(other) temp_x,temp_y=<a href="/x" class="user-mention" title="@x"><i>@</i>x</a>,<a href="/y" class="user-mention" title="@y"><i>@</i>y</a></p> <p><a href="/x" class="user-mention" title="@x"><i>@</i>x</a>,<a href="/y" class="user-mention" title="@y"><i>@</i>y</a>=other.x,other.y</p> <p>other.x,other.y=temp_x,temp_y return self</p> <p>end</p> <p>end</p> <p>p0=Point.new p1=Point.new(1.0,2.0)</p> <p>p0.swap(p1)</p> <p>在 Mac 运行的时候，提示： Traceback (most recent call last): 1: from point.rb:24:in <code>&lt;main&gt;' point.rb:9:in</code>swap': wrong number of arguments (given 0, expected 1) (ArgumentError)</p> <p>指出传入的参数为 0，但是<a href="/x" class="user-mention" title="@x"><i>@</i>x</a>,<a href="/y" class="user-mention" title="@y"><i>@</i>y</a>=other.x,other.y 中，other.x,other.y 这样就不算参数了？需要如何去修改这个代码？ </p> <p>新手不懂，麻烦告知。谢谢</p> Thomas Sat, 06 Apr 2019 23:50:07 +0800 https://ruby-china.org/topics/38354 https://ruby-china.org/topics/38354