Programmer Group

I found a calculator program written in college, and a graphical interface, which can graphically display the expression syntax tree, ha ha;) There are only 200 lines of Java code, which can not only calculate addition, subtraction, multiplication and division, but also match parentheses~ Code comments: From simple interface color matching to ...

[introduction]: in the previous article about IIR design, some friends are still reading it. Although I don't know how the officials feel, I think there is always a reward to read, so I decided to continue this series. This article talks about average filter, which is very easy at first glance. But I don't think some of the key points are clear ...

code refactoring This can provide a simplified game framework and realize code reuse #include<stdio.h> #include<stdlib.h> #include<conio.h> int x, y; int high, width; void startup() { high = 20; width = 30; x = high / 2; y = width / 2; } void show() { system("cls"); int i, j; for(i = 0; i < high; i++) //Show ...

This skill comes from my actual development: This function is used to convert ip address into network byte order. Its prototype is in addr INET addr (const char * CP); The return value is an in ﹣ addr ﹣ T type. Obviously, this is not a standard data type of c language. If you want to find out what type it is, you must find the header file. ...

Determine whether a graph is a tree problem Given an undirected graph, we can judge whether the graph is a tree. input The input has several test samples. The first line is the number of test samples, followed by several test samples. The first line of each test sample is the node number n, and the nodes use 1,2 , n number. The second line is t ...

notes preceding the text of a book or following the title of an article Introduce the methods of map, reduce, and filter built-in functions in Python 1: map map(...) map(function, sequence[, sequence, ...]) -> list Execute function(item) for item in sequence, and output the result as list. >>> map(str, range(5)) #st ...

Title:There is a number in the array that appears more than half the length of the array. Please find this number. For example, enter an array of length 9 {1,2,3,2,2,2,5,4,2}. Since the number 2 appears five times in the array, more than half the length of the array, output 2. Output 0 if it does not exist.  Resolution:Seeing this problem, ...

XPath (XML Path Language) is a language for finding information in XML documents, which can be used to traverse elements and attributes in XML documents. lxml Is an HTML/XML parser, the main function is how to parse and extract HTML/XML data. lxml, like regular, also uses C is a high-performance Python HTML/XML parser. We can use the XPa ...

The where clause is used to find records from tables or temporary datasets that meet the specified conditions, and can be used for conditions in select, update, and delete statements. 1, Generate test data Use the following SQL to create the super girl basic information table (t? Girl) and insert some test data. create table T_GIRL ( id ...

1, Source code description Freecplus is a C/C + + open source framework under Linux system. Please go to the C language technology network (www.freecplus.net) to download the source code. This paper introduces the method of log file operation in freecplus framework. The declaration file for functions and classes is freecplus / 65124; freecplus ...