Programmer Think

Exercise 6-7 simple calculator (20 points) Simulate the operation of a simple arithmetic unit. Assuming that the calculator can only perform addition, subtraction, multiplication and division, and the operands and results are integers, the four operators have the same priority and are calculated from left to right. Input format: Input gives ...

[example introduction] mobile camera recognition can realize ar ranging. At least three years of development experience can make it through [example screenshot] File: 590m.com/f/25127180-490561034-8afed0 (access password: 551685) [core code] using UnityEngine; using UnityEngine.XR.ARFoundation; ///Ar ruler AR function management public cl ...

1. Background Example: create a window to sell tickets, and the total number of tickets is 100 Use the way to implement the Runnable interface * 1. Problem: in the process of selling tickets, there are duplicate tickets and wrong tickets -- > there are thread safety problems2. Cause of the problem: when a thread is operating the ticket ...

Application of time date correlation - datetime64 numpy.busday_offset (dates, offsets, roll='raise', weekmask='1111100', holidays=None, busdaycal=None, out=None) First adjusts the date to fall on a valid day according to the roll rule, then applies offsets to the given dates counted in valid days. This function is used to determine wheth ...

Shortcut key ctrl+c copy (not available in cmd) ctrl+v paste ctrl+x cut ctrl+a select all s ctrl+d copies the current line to the next line alt+f4 close window alt+insert constructs with and without parameters ctrl+z undo ctrl+s save Shift + delete permanently delete win+r command line ctrl+shift+esc Task Manager ctrl+h inheritance ...

This article was first published in: Walker AI In their work, algorithm engineers often need to quickly write some demo, such as quickly demonstrating some algorithms, or writing tools for data annotation. The common implementation method is that algorithm engineers try to write APIs with flash and other frameworks, and then front-end engine ...

std::string itself realizes the management of character array and provides common functions of string class, For example, lookuptoggle casestructure wait But std::string is a runtime calculation after all. As we all know, after std C++11, it supports calculating some constant values during compiler compilation, which can reduce runtime work ...

Those who are familiar with the drawing process know that ViewGroup can decide the drawing time and call times of child. Today we will start from RelativeLayout Start learning and see how many times it calls onMeasure for the child View. For simplicity, we choose the time to enter the Activity in the previous blog When entering Activity, why ...

For the use of multithreading, this paper briefly introduces several ways of using multithreading, and uses several simple examples to introduce multithreading. The compiler is visual studio. 1, AsyncFuture The knowledge points used are std::async and std::future 1. std::async function prototype template<class Fn, class... Args> futur ...

For this hint function, I did all kinds of searches for a few hours. Maybe my posture is wrong. I shouldn't use Bing. I should learn from giant to use Google gayhub and so on. In order to save everyone's time, I put the key content in front. The content behind the blog is no use for personal complaints anyway. Demonstration effect: using Unit ...