CalculatorApp | Basic Calculator using Java | Apps library
kandi X-RAY | CalculatorApp Summary
kandi X-RAY | CalculatorApp Summary
Basic Calculator using Java Swing. Utilizes order of operations to properly evaluate expressions.
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Top functions reviewed by kandi - BETA
- Reads an input
- Returns true if the given string is a valid number
- Checks if two strings have a precedence
- Evaluates the operation
- Checks that the input is valid
- Returns true if the given string is an operator
- The main method
- Start the menu
CalculatorApp Key Features
CalculatorApp Examples and Code Snippets
Community Discussions
Trending Discussions on CalculatorApp
QUESTION
I am trying to teach myself Python Kivy and I have been working with this calculator program. I want to make the text for exponent different than what it being processed. It is normally ** but I want it to show ^ on the button. How do I get it show one thing and put in a different thing in the entry.text += self.text part. The other way I was thinking was trying to use a decorator, but I am not sure how to do that for an operator like that.
Any ideas?
main.py
...ANSWER
Answered 2020-Mar-12 at 03:22if I understood, this will resolve:
QUESTION
import 'package:flutter/material.dart';
void main() => runApp(new CalculatorApp());
class CalculatorApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(title:'Bending Calculator',
home: Calculator()
);
}
}
class Calculator extends StatefulWidget {
@override
State createState() => Calculatore();
}
class Calculatore extends State {
final a = TextEditingController();
final b = TextEditingController();
final c = TextEditingController();
// controller mentioned
String total= "";
void calculate() {
int numberA = int.parse(a.text);
int numberB = int.parse(b.text);
int numberC = int.parse(c.text);
int result;
// if numberA have value then answer will be a+c
if(
// what condition to do here for between choosing between textfields a or b.
// i tried numberB ==null that does not work
// very much confused, no idea what to do please help
){
result = numberA + numberC
} else{ result = numberB + numberC
}
setState(() {
total = "$result";
});
}
@override
Widget build(BuildContext context) {
return Scaffold(appBar: AppBar(title:Text("Calculator")),
body: SafeArea(
child: ListView(
children: [
Row( mainAxisAlignment: MainAxisAlignment.center ,
children: [
ANSWER
Answered 2020-Feb-06 at 11:52As I understand you have tried checking whether the value of text field b is null. Have you tried to check whether b.text.isEmpty or isNotEmpty.
QUESTION
I sort of just wanted to have my code reviewed for logical purposes. I think it works out the way I expect it to but I'd like to double check with peers who are more versed in C#.
So here I am testing a console application which validates user input. I am using StringReader to simulate the user response. So I entered in 5 as my response and if my response is not a valid float then I should receive an error.
I tested this against a non-float value and my for loop caused me to enter a insufficient memory exception which makes sense. But for some reason in my test, I feel like I'm writing to my Input1() function and just validating that my input was indeed the value that i simulated? Or is my test actually validating that the return value of Input1() is actually num1 in the form of a float - thus passing my validation?
Sorry if this is overkill and not making sense.
...ANSWER
Answered 2020-Jan-03 at 21:43Ok, so there are a few points to your question. First, let's clean up the code a bit:
QUESTION
Trying to get my unit test to run but after clicking "run tests", I just get "NUnit3TestExecutor converted 1 of 1 NUnit test cases" in my output. The test tries to run but just ends up loading forever till I have to manually cancel the process. Any idea what could be causing this?
...ANSWER
Answered 2020-Jan-03 at 02:43Based on your use of Console.SetOut I'm assuming you are testing a console program. I'm also assuming that it waits for input from the user.
Unfortunately, it is not getting any input from your code, so it hangs.
Testing a console app by driving it's input and output is possible but complicated. You would usually need to launch it in a separate process, monitor the standard and error outputs and drive the input. Most people do not test this way - at least not those experienced with unit testing.
A better approach is to test the backend that does your calculations.
There's one other complication I should mention... NUnit itself takes control of console output. For that reason, your test would need to save the current output setting and restore it before exiting - otherwise, NUnit's continued processing will be broken.
QUESTION
When I run this console app, everything works fine but except for my UserAnswer() result. It keeps returning a value of '0' for both num1 & num2. This doesn't make sense to me because I don't receive any errors for declaring a new value for num1 & num2 in Input1() & Input2() methods. It compiles and runs fine but why is it not picking up the new values of these variables?
...ANSWER
Answered 2019-Dec-30 at 20:58This is your problem:
QUESTION
I am getting the infinite loop on my last while loop where it states: while (Valid3 == false)... I expect to receive the console.writeline("invalid input please try again"), until the user satisfies the argument but instead when i enter an invalid input i receive infinite loop. Though i feel the logic im using here is the same as the logic in the loops used beforehand. Below is all my code.
...ANSWER
Answered 2019-Dec-26 at 18:35move your Console.ReadLine() inside your while loop
QUESTION
I am writing a calculator app as a project for FreeCodeCamp. I have decided to write it using React and Redux. I've written the Redux part of the app, and I started to connect Redux to React.
When I wrote all the code to connect Redux to my React app, the rendering stopped working. I used different console.log() statements to track down where the JavaScript was choking, and I narrowed it down to the connect statement found on line 241 of the linked Codepen. If you comment out line 242, and replace line 255 with
ReactDOM.render(, wrapper);
the app renders. However, the same code running on FreeCodeCamp's platform appears to work.
Here is the link to my CodePen: JavaScript Calculator.
The challenge I used on FreeCodeCamp to test my code can be found here: FCC Challenge
The exact code I adapted from FCC (in order to get the editor to render my component) is below. You can see the changes I made from the Pen are only in the rendering part of the code.
...ANSWER
Answered 2019-Sep-24 at 22:55Because the order in which you import external scripts matters.
Put redux below react because react-redux requires React to be present in the global scope.
Correct order is:
- react
- react-dom
- redux
- react-redux
QUESTION
I try to get familiar with python GUI, so in order to do so I'm building a simple calculator. Most of it works, but I'm trying to add a scrollbar to my text display widget, when I use the following piece of code:
...ANSWER
Answered 2019-Sep-21 at 15:21Indeed, the geometry manager cannot mix pack and grid in the same section. So you have to choose one mode to organize the layout of the window, or split the window into 2 frames to be able to pack widgets in one and grid in the other.
You can try with the following :
QUESTION
I know this question was asked multiple times but those solutions didnt help me, or i really dont get it.
I want to add numeric buttons with the help of python "for loop", but when i do it i get the following error:
"self.ids.GoodsContainer.add_widget(Button(text="hi")) File "kivy\properties.pyx", line 863, in kivy.properties.ObservableDict.getattr AttributeError: 'super' object has no attribute 'getattr'"
I am stuck here for a very long time.
Whenever i delete the button part in the 'GoodsView()' (python file) the porgram runs perfectly. So i could just type the numbers myself in "kv rule" but later i want to add labels which are generated by functions so i need to find a way now or later i will have more problems.
py:
...ANSWER
Answered 2019-Jul-20 at 10:17The problem is that the ids dictionary isn't yet populated during __init__, because all the other widgets haven't been created and added to one another yet.
Try doing something like
QUESTION
This question already exists on stackoverflow but the solutions for them didnt worked for me.
Based on what i read online this error occurs, when there is an unidentified child widget in the kv file, but i have already identified all my widgets in the 'py' file
I have tried moving down the "Builder.load_file" (by down i mean after the class-es) and it worked properly, but then i couldnt bind widgets with functions, it showed some other error. So this was not a permanent solution.
important parts of my 'py' and 'kv' files
py:
...ANSWER
Answered 2019-Jul-18 at 15:58You are getting the error, kivy.factory.FactoryException: Unknown class because in the kv file, when it is creating the root it tries to instantiate the child, Manager: object but it could not find the implementation of class Manager() before the Builder.load_file() function.
- Remove
kv = Builder.load_file("pcapp.kv") - Replace
return kvwithreturn Builder.load_file("pcapp.kv")
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Install CalculatorApp
You can use CalculatorApp like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the CalculatorApp component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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