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.
利用栈完成算术表达式求值：从键盘或文件中输入算术表达式，计算其结果并显示。
Done using an arithmetic expression evaluation stack: file input from the keyboard or an arithmetic expression, calculate and display the results.
这种抽象支持在单一物理资源上运行多个操作系统和应用程序栈，从而实现更高程度的资源利用。
This abstraction enables multiple operating systems and application stacks to run on a single physical resource, thus enabling higher levels of resource utilization.
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