关于操作符？

请问各位：
  1. 如果说a=1000，b=0100，那么计数器（定义变量为temp）从0000 计数到a to a+b时 信号y<='1' ,其余y<='1' 。即当temp在a至a+b时y<='1' ，其余为‘0’。这样怎么变程序阿，我写的怎么都不对。
是不是要将a、 b转换成整数进行加法，怎么转换阿？
谢谢各位

不用吧    直接计数就OK了   再用IF。。。。else作判断啊

module count4(clk,reset,out,y);<br>
<br>
&nbsp; &nbsp; &nbsp; &nbsp; input clk;<br>
&nbsp; &nbsp; &nbsp; &nbsp; input reset;<br>
&nbsp; &nbsp; &nbsp; &nbsp; output [3:0] out;<br>
&nbsp; &nbsp; &nbsp; &nbsp; output y;<br>
&nbsp; &nbsp; &nbsp; &nbsp; <br>
&nbsp; &nbsp; &nbsp; &nbsp; reg [3:0] out;<br>
&nbsp; &nbsp; &nbsp; &nbsp; reg y;<br>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <br>
&nbsp; &nbsp; &nbsp; &nbsp; always @(posedge clk)<br>
&nbsp; &nbsp; &nbsp; &nbsp; begin<br>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if(!reset)<br>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; out &lt;= 4'b0;<br>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; else <br>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; out &lt;= out + 1;<br>
&nbsp; &nbsp; &nbsp; &nbsp; end<br>
&nbsp; &nbsp; &nbsp; &nbsp; <br>
&nbsp; &nbsp; &nbsp; &nbsp; always @(negedge clk)<br>
&nbsp; &nbsp; &nbsp; &nbsp; begin<br>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (out &gt;= 4'b0100 &amp;&amp; out &lt;= 4'b1000)<br>
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; y = 1;<br>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; else<br>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; y=0;<br>
&nbsp; &nbsp; &nbsp; &nbsp; end<br>
<br>
endmodule

4'b0100 中的&rsquo;b是什么，怎么老有错误，书上也没有查到，谢谢您！

binary<br>
<br>
你先看看例子吧

你是不是直接从这个网页拷贝的？？？

b表示二进制，你最好把程序贴出来看看！