利用栈求表达式的值，可供小学生作业，并能给出分数

[{"title":"（ 15 个子文件 294KB ） 利用栈求表达式的值，可供小学生作业，并能给出分数","children":[{"title":"数据结构课设","children":[{"title":"Cpp1.dsp <span style='color:#111;'> 3.30KB </span>","children":null,"spread":false},{"title":"Cpp1.plg <span style='color:#111;'> 2.67KB </span>","children":null,"spread":false},{"title":"n_rec.txt <span style='color:#111;'> 4B </span>","children":null,"spread":false},{"title":"Cpp1.opt <span style='color:#111;'> 47.50KB </span>","children":null,"spread":false},{"title":"Cpp1.cpp <span style='color:#111;'> 10.22KB </span>","children":null,"spread":false},{"title":"markrec.txt <span style='color:#111;'> 2B </span>","children":null,"spread":false},{"title":"Cpp1.ncb <span style='color:#111;'> 41.00KB </span>","children":null,"spread":false},{"title":"Debug","children":[{"title":"Cpp1.pch <span style='color:#111;'> 217.90KB </span>","children":null,"spread":false},{"title":"vc60.idb <span style='color:#111;'> 33.00KB </span>","children":null,"spread":false},{"title":"vc60.pdb <span style='color:#111;'> 52.00KB </span>","children":null,"spread":false},{"title":"Cpp1.pdb <span style='color:#111;'> 569.00KB </span>","children":null,"spread":false},{"title":"Cpp1.ilk <span style='color:#111;'> 272.41KB </span>","children":null,"spread":false},{"title":"Cpp1.exe <span style='color:#111;'> 212.05KB </span>","children":null,"spread":false}],"spread":true},{"title":"Cpp1.dsw <span style='color:#111;'> 516B </span>","children":null,"spread":false},{"title":"shitiku.txt <span style='color:#111;'> 0B </span>","children":null,"spread":false}],"spread":true}],"spread":true}]