Logisim四位排序器
先使用1位的swap搭建4位的swap，再使用4位的swap模块和Logisim内置的comparator元件搭建排序电路(请不要使用Plexers类元件)

功能描述:该电路具有4个4位的二进制数字作为输入和4个4位的二进制数字作为输出。它的功能是，将4个输入的二进制数字进行排序，从上往下数第一个输出端口输出的是4个数字中最小的，第二个输出端口输出的是第二小的，以此类推。
输入： A,B,C,D(4bit)
输出： #1,#2,#3,#4(4bit)(#1对应第一个输出端口，以此类推)
文件内 1 位swap模块名: 1bit_swap
文件内 4 位swap模块名: 4bit_swap
文件内 排序电路模块名: 4bit_sort(Logisim four bit sorter

Build a 4-bit swap using a 1-bit swap, and a sort circuit using a 4-bit swap module and a built-in comparator component in Logisim (do not use Plexers class components)



Function Descr iption: The circuit has four 4-bit binary digits as input and four 4-bit binary digits as output. Its function is to sort the four input binary digits. The output from the first output port is the smallest of the four digits, the output from the second output port is the second smallest, and so on.

Input: A, B, C, D (4bit)

Output: #1, #2, #3, #4 (4bit) (#1 corresponds to the first output port, and so on).

The 1 bit swap module name in the file is 1bit_swap

The 4 bit swap module name in the file is 4bit_swap

File sorting circuit module name: 4bit_sort)