利用后缀表达式计算中缀表达式的值

[{"title":"（22个子文件408KB）利用后缀表达式计算中缀表达式的值","children":[{"title":"calculator","children":[{"title":"calculator.h <span style='color:#111;'>4.96KB</span>","children":null,"spread":false},{"title":"main.opt <span style='color:#111;'>47.50KB</span>","children":null,"spread":false},{"title":"calculator.plg <span style='color:#111;'>1.28KB</span>","children":null,"spread":false},{"title":"main.ncb <span style='color:#111;'>33.00KB</span>","children":null,"spread":false},{"title":"utility.h <span style='color:#111;'>6.86KB</span>","children":null,"spread":false},{"title":"main.dsw <span style='color:#111;'>533B</span>","children":null,"spread":false},{"title":"calculator.ncb <span style='color:#111;'>57.00KB</span>","children":null,"spread":false},{"title":"Debug","children":[{"title":"vc60.pdb <span style='color:#111;'>68.00KB</span>","children":null,"spread":false},{"title":"main.ilk <span style='color:#111;'>314.93KB</span>","children":null,"spread":false},{"title":"vc60.idb <span style='color:#111;'>57.00KB</span>","children":null,"spread":false},{"title":"main.pdb <span style='color:#111;'>505.00KB</span>","children":null,"spread":false},{"title":"main.obj <span style='color:#111;'>46.37KB</span>","children":null,"spread":false},{"title":"main.pch <span style='color:#111;'>435.13KB</span>","children":null,"spread":false},{"title":"main.exe <span style='color:#111;'>248.07KB</span>","children":null,"spread":false}],"spread":true},{"title":"lk_stack.h <span style='color:#111;'>4.92KB</span>","children":null,"spread":false},{"title":"main.plg <span style='color:#111;'>738B</span>","children":null,"spread":false},{"title":"node.h <span style='color:#111;'>640B</span>","children":null,"spread":false},{"title":"main.cpp <span style='color:#111;'>669B</span>","children":null,"spread":false},{"title":"calculator.opt <span style='color:#111;'>53.50KB</span>","children":null,"spread":false},{"title":"calculator.dsw <span style='color:#111;'>545B</span>","children":null,"spread":false},{"title":"main.dsp <span style='color:#111;'>3.30KB</span>","children":null,"spread":false},{"title":"calculator.dsp <span style='color:#111;'>4.47KB</span>","children":null,"spread":false}],"spread":false}],"spread":true}]