Design a program, enter a decimal number four, with four LED display.
设计一个程序，输入四个一位十进制数，用4个LED显示出来。
Master the stack to achieve a decimal number converted to octal number of operation.
掌握利用栈实现十进制数转换成八进制数的运算。
Master the stack to achieve a decimal number converted to octal number of operation.
掌握利用栈实现十进制数转换成八进制数的运算。
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