number = '' if c in ['+', '-']: # - check operator level with op_stack[-1], # - if current level is not greater than op in stack, # - calculate the op in stack while op_stack and (op_stack[-1][1] >= level): calc_op() # - push current op in op_stack op_stack....
Author: ouankou LeetCode 第772题 Basic Calculator III 简要分析及Python代码 题目: Implement a basic calculator to evaluate a simple expression string. The expression string may contain open and closing parentheses , the plus or minus sign , non-negative integers and empty spaces. The expression st...
个人博客:http://fuxuemingzhu.me/ 题目地址:https://leetcode.com/problems/basic-calculator-ii/description/ 题目描述: Implement a basic calculator to evaluate a simple expression string. The expression string contains only non-negative integers, +, -, *, / operators and empty spaces . The integer...
227.Basic Calculator II 题意:和1相比,增加了乘号和除法,不过反而把括号去掉了,求表达式结果。 栈 下面是基于Python2,因为LeetCode只允许Python2,需要注意的是,//得到的是它们的商再向下取整,特别是负数的时候。比如: print3//2# 1print-3//2# -2 思路:使用sign保存上一个表达式的运算符,如果+或者-,则...
python3 使用中缀转后缀的方法。这个过程中会用到单调栈。 python PRIORITY = {'#':0,'(':1,')':1,'+':2,'-':2,'*':3,'/':3, }classSolution:""" @param s: the expression string @return: the answer """defcalculate(self, s):expression = [] val =Noneforcharins:ifchar ==' '...
Python Code:# Define a class called Calculator to perform basic arithmetic operations class Calculator: # Define a method for addition that takes two arguments and returns their sum def add(self, x, y): return x + y # Define a method for subtraction that takes two arguments and returns ...
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A basic, yet powerful calculator app built using Python. This project demonstrates the use of fundamental programming concepts such as functions, conditionals, and loops. It allows users to perform basic arithmetic operations including addition, subtract
Basic calculator program using Java Below is an example to create a basic calculator using Java ? import java.util.Scanner; public class Calculator { public static void main(String[] args) { double num1; double num2; double ans; char op; Scanner reader = new Scanner(System.in); System....
3,Python as a calculator Suppose you have $100, which you can invest with a 10% return each year. After one year, it's 100×1.1=110 dollars, and after two years it's 100×1.1×1.1=121. Add code to calculate how much money you end up with after 7 years, and print the result....