Programmer Group

The year is coming. It's time to give out the year-end bonus. So I went to the Internet to find the personal tax calculator, but I found it was a little like a virus website. So the result of calculation is not very dare to believe, so ponder, or write a personal income tax calculator by yourself. First, I went to the State Administration of T ...

A stack is a linear table that can only be inserted and deleted at the end of a table. There are many applications of stack, such as common recursion, computer expression evaluation and so on. Next we use the stack to realize the simple four arithmetic calculators. Here are the ideas of this article: Data structure and operation of chain stack ...

The last article talked about the six basic layouts of android: https://blog.csdn.net/qq_40205116/article/details/88418781 This article uses layout to make an android small project (calculator). The effect is as follows (those who wanted to insert video, but found that they couldn't insert video, could only insert pictures. He ...

Title Description Read in a non negative integer evaluation expression containing only +, -, *, /, and evaluate the value of the expression. input The test input contains several test cases, each of which takes up one line, with no more than 200 characters in each line. Integers and operators are separated by a space. There ...

yield def test(): for i in 'abc': yield i for i in [1, 2, 3]: yield i if __name__ == '__main__': gen = test() print(gen.send(None)) print(gen.send(None)) print(gen.send(None)) print(gen.send(None)) print(gen.send(None)) print(gen.send(None)) print(gen.send(None)) d ...

There are four categories of variables IntVar(): integer variable, default is 0. DoubleVar(): floating point variable, default is 0.0 StringVar(): string variable, null by default Boolean var(): boolean variable, True is 1, False is 0. 41 set() and get() usage: from tkinter import * win=Tk() def view(): global Message if Message==False ...

Title Source: http://129.211.20.246/problem.php?id=1018 Title Description NCL is a laboratory specializing in the improvement and upgrading of calculators. Recently, the laboratory received a task entrusted by a company: it needs to add the function of solving one yuan one order equation to a certain type of calculators of t ...

Let's see the effect first: Is it cool? Do you want to? Want it. Of course the author knows you must. Otherwise it won't come in at all, right. Okay. Get to the point. 1. Overview This is a simplified version made following the calculator that comes with win10. It is made with Qt and the whole expression is directly entered and the resul ...

Background: Beginners of programming will have such problems. When encountering problems, they intuitively use the logic that the computer can understand to describe the problems to be solved and the specific solution process. However, such programs are only to meet the current needs and are not easy to maintain and expand. Problem solving idea ...

Button (parent object, options...)options take the value borderwidth or bd: the border width defaults to two pixels; bg: background color; command: when you click a button, execute this method; cursor: the shape on which the mouse moves to the button; fg: foreground color.Font: font; height: high; highlightbackground: the background color when ...