java calculator code

basically ' lambda x,y:x+y '. OK, now let's run this code to check the results. >>> Calc (). Transform (G.parse (' 1 + 2 *-( -3+2)/5.6 + 30 ')) 31.357142857142858 What about eval ()? 7 >>>eval (' 1 + 2 *-( -3+2)/5.6 + 30 ') 31.357142857142858 Succeeded:)Last step: REPL For the sake of beauty, we wrap it up in a nice calculator REPL: Defmain (): calc=calc () whiletrue: try: s=raw_input (' > ')

Each method corresponds to a rule. If the method does not exist, the __default__ method is invoked. We omitted Start,add_symbol and Mul_symbol, because they would only return their own branches. I used float () to parse the numbers, which is a lazy way, but I can do it with a parser. To keep the statement clean, I used the operator module. For example, add is basically ' lambda x,y:x+y ' or something like that. OK, now let's run this code to

(AddButton); Pack (); } Private classInsertactionImplementsActionListener { Public voidactionperformed (ActionEvent e) {String input=E.getactioncommand (); String text=Display.gettext (); if(start) {Display.settext (""); Start=false; } if(Text.startswith (".") {Display.settext ("0" + display.gettext () +input); } Else if(Text.startswith (" -0.") | | Text.startswith ("0.")) {Display.settext (Display.gettext () )+input); } Else if(Text.startswith ("-0")) {Display.settext ("-" +input)

PHP Calculator The code is as follows Copy Code $num 1=true ; $num 2=true; $numa =true; $numb =true; $message = ""; //single channel branch if (isset ($_get["sub")) { if ($_get["NUM1"]== "") { $num 1 = False $message. = "First number cannot be empty"; }if (!is_numeric ($_get["NUM1"])) {$numa =false;$messag

take a look at the concrete implementation. >>>importoperator as Op >>>fromplyplusimportstransformer Classcalc (Stransformer): Def_bin_operator (Self, exp): Arg1, Operator_symbol, Arg2=exp.tail operator_func={' + ': Op.add, '-': op.sub, ' * ': Op.mul, '/': Op.div}[operator_symbol] Returnoperator_func (Arg1, arg2) Number =lambdaself, Exp:float (Exp.tail[0]) Neg =lambdaself, exp:-exp.tail[0] __default__=lambdaself, Exp:exp.tail[0] Add=_bin_operator Mul=_bin_operator Each method corresponds

a look at the specific implementation. >>>importoperatorasop >>>fromplyplusimportSTransformer classCalc(STransformer): def_bin_operator(self,exp): arg1,operator_symbol,arg2=exp.tail operator_func={'+':op.add, '-':op.sub, '*':op.mul, '/':op.div}[operator_symbol] returnoperator_func(arg1,arg2) number=lambdaself,exp:float(exp.tail[0]) neg=lambdaself,exp:-exp.tail[0] __default__=lambdaself,exp:exp.tail[0] add=_bin_operator mul=_bin_

The following small series will bring you a javascript simple calculator code editor that feels quite good. Now I will share it with you and give you a reference. Let's take a look at it. Today, I am bored. I want to write something and suddenly want to write a calculator using javascript. There are still a lot of bugs in the program. Record them here and then sl

JavaScript implementation Simple Calculator instance code this article mainly introduces the JavaScript implementation of simple calculator instance code of the relevant information, the need for friends can refer to the following 1234567891011121314151617181920212223242526272829303132333435363738394041424

The following small series will bring you an html + js simple calculator code (addition, subtraction, multiplication, division ). I think this is quite good. Now I will share it with you and give you a reference. Let's take a look at the simple calculator code in html + js (addition, subtraction, multiplication, divisi

html+js Implement simple calculator code (subtraction) Screenshot below: The above html+js to achieve a simple calculator code (subtraction) is a small series to share all the content, hope to give you a reference, but also hope that we support the cloud habitat community.

Recently written a simple calculator code program, first show you Share the code as follows Now it's just a simple standard calculator that can perform subtraction continuous operations and residual operations. If there is an error with a divisor of zero, the following is a hint, like this: This is my

Programming of a policy mode codeusingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingsystem.web;/// ///Summary description of Class1/// Public InterfaceCalculator//declaring a computed interface { DoubleCal (DoubleADoubleb); } Public classAdd:calculator//The interface implements the addition operation { Public DoubleCal (DoubleADoubleb) {Doubleresult =0; Result= A +b; returnresult; } } Public classSub:calculator//The interface implements the subtraction

[Java]* Start the program header annotation.* Copyright and version Declaration of the program* Copyright (c) 2011, a student from the computer College of Yantai University* All rights reserved.* File name: Calculator* Author: Xue Guangchen* Completion date: January 1, September 22, 2011* Version No.: x1.0* Description of tasks and Solutions* Input description:* Problem description: implements a

the code after debugging and running the code will appear a javaapplet Calculator interface.During debugging, there may be interfaces but not small programs, because there is no initialization applet, then we should initialize the applet in the main function so that the applet can run! After debugging and operation is completely correct, we can follow our own ho

Nonsense less say directly on the code, hope to see friends and I can communicate more,, thank youPackage Myjisuanqi;Import Java.awt.BorderLayout;Import Java.awt.Button;Import Java.awt.Frame;Import Java.awt.GridLayout;Import Java.awt.Panel;Import Java.awt.TextField;Import java.awt.event.MouseEvent;Import Java.awt.event.MouseListener;public class MainFrame03 extends Frame implements mouselistener{Private String first;Private String second;Private Strin

This example share the pure JS code to achieve a simple calculator code, I believe you will like. Specifically as follows:The screenshot of the running effect is as follows: The specific code is as follows: Copy and paste the above code to achieve a simple

Python3.5 + PyQt5 + Eric6, a calculator code, pyqt5eric6 Currently, simple computing can be implemented. Reset before calculation. The default number during design is 0. After learning for half a day, we made such a result, with many bugs. Python3.5 + PyQt5 + Eric6 can run the calculator perfectly in the 32-bit Windows 7 system. After a simple learning for half a

This article mainly introduces a simple calculator code program written in js, which is very practical. Interested partners can refer to a simple calculator code program recently compiled. Let's show it to you first. The sharing code is as follows: SUM: 1 2 3

Copy CodeThe code is as follows: Single-channel Branch if (Isset ($_get["sub"])) { $num 1=true;//Whether the number 1 is an empty tag $num 2=true;//Whether the number 2 is an empty tag $numa =true;//Number 1 is a number $numb =true;//Number 2 is a bit number $message = ""; Determines whether the number 1 is empty if ($_get["NUM1"]== "") { $num 1=false; $message. = "The first number cannot be empty"; } Determine if the number 1 is a num

=newcomputeractionlistener ();//Key listener//calculation area textcomputer= newjtextfield (); Textcomputer.settext (""); Textcomputer.seteditable (false); Textcomputer.setbackground (Newcolor (255,255,255));//function key upper half part panelkeys_up=newjpanel (); Panelkeys_up.setlayout (Newflowlayout (flowlayout.right)); Buttonbk=newjbutton ("Backspace "); Buttonbk.setforeground (Newcolor (255,0,0)); Buttonc=newjbutton (" C "); Buttonc.setforeground (Newcolor (255,0,0)); Buttonbk.addactionlist