摘要:表达式求值#include<iostream>//输入的表达式要以'#'结尾，如‘5+6*3/(3-1)#’#include<cstring>#include<cstdio>#include<cctype>#include<stack>usingnamespacestd;stack<char>opter;//运算符栈stack<double>opval;//操作数栈intgetIndex(chartheta){intindex=0;switch(theta){case'+':index=0;break;case'-':index=1;break;//获取theta所对应的索引 case'*':index=2;break;case'/':index=3;break;case'(':index=4;break;case')':index=5;break;case'#':index=6;default:break;}returnindex;}chargetPriority(chartheta1,chartheta2)与theta2之间的优先级{//获取theta1 constcharpriority[][7]=//算符间的优先级关系{{'>','>','<','<','<','>','>'},{'>','>','<','<','<','>','>'},{'>','>','>','>','<','>','>'},{'>','>','>','>','<','>','>'},{'<','<','<','<','<','=','0'},{'>','>','>','>'
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