操作数栈

操作数栈（Operand Stack） https://www.jianshu.com/p/c0f267ff3a2d

操作数栈（Operand Stack） https://blog.csdn.net/z318913/article/details/123004876?utm_medium=distribute.pc_relevant.none-task-blog-2~default~baidujs_title~default-2-123004876-blog-81349398.pc_relevant_vip_default&spm=1001.2101.3001.4242.2&utm_relevant_index=5

Expression Evaluation Using Stack  https://www.codingninjas.com/blog/2021/10/01/expression-evaluation-using-stack/