Example : Infix : (A+B) * (C-D) ) Postfix: AB+CD-* 算法: 1. Scan the infix expression from left to right. 2. If the scanned character is an operand, append it to result. 3. Else 3.1 If the precedence of the scanned operator is greater than the preceden…

Conversion Algorithm 1.操作符栈压入"#": 2.依次读入表达式的每个单词: 3.如果是操作数则压入操作数栈: 4.如果是操作符,则将操作符栈顶元素与要读入的操作符进行优先级比较 (4.1)如果读入的是 ')',则将操作符栈中的元素压入操作数栈直至遇到 '(': (4.2)如果读入的是 '(',压入操作符栈: (4.3)如果栈顶元素优先级低,压入操作符栈: (4.4)如果读入的元素不为'#',以及栈顶元素优先级高,则将栈顶元素压入操作数栈,将读入的元素压入操作符栈…

#include<iostream> #include<stack> #include<string> #include<deque> using namespace std; char compare(char tp, char op) { if (((tp == '+' || tp == '-') && (op == '*' || op == '/')) || (tp == '#')) return '<'; else if (tp…

#include<iostream> #include<stack> #include<string> #include<deque> using namespace std; char compare(char tp, char op) { if (((tp == '+' || tp == '-') && (op == '*' || op == '/')) || tp == '#') return '<'; return '>'…

#include<stack> #include<iostream> #include<string> using namespace std; //优先级判断 char compare(char opt, char si) { if((opt=='+'||opt=='-')&&(si=='*'||si=='/') return '<'; else if(opt=='#') return '<'; return '>'; } //判断是…

http://geeksquiz.com/stack-set-2-infix-to-postfix/ #include <iostream> #include <vector> #include <algorithm> #include <queue> #include <stack> #include <string> #include <fstream> #include <map> #include &l…

Infix expression: The expression of the form a op b. When an operator is in-between every pair of operands.Postfix expression: The expression of the form a b op. When an operator is followed for every pair of operands. Input : abc++ Output : (a + (b…

Postfix to Prefix Conversion Postfix: An expression is called the postfix expression if the operator appears in the expression after the operands. Simply of the form (operand1 operand2 operator).Example : AB+CD-* (Infix : (A+B) * (C-D) ) Prefix : An…

题目描述 将中缀表达式(infix expression)转换为后缀表达式(postfix expression).假设中缀表达式中的操作数均以单个英文字母表示,且其中只包含左括号'(',右括号‘)’和双目算术操作符+,-,*,/. 输入格式 第一行是测试样例个数n.以下n行,每行是表示中缀表达式的一个字符串(其中只包含操作数和操作符和左右括号,不包含任何其他字符),长度不超过100个字符. 输出格式 为每一个测试样例单独一行输出对应后缀表达式字符串(其中只包含操作数和操作符,不包含任何其他字符…

public class Test {    public static void main(String[] args) {     SimpleCalculator s=new SimpleCalculator();  String methord="80*(1+0.5)"; //test   double d=s.evaluate(methord );   System.out.println(d);  } }         import java.util.Scanner;…