Programmer Group

The official gives the early steps of opening the cash red envelope 1. It is worth noting that the calling IP address (public IP) needs to be configured in wechat payment merchant platform product center cash red packet product settings 2. Integrated business development thinking Official account offici ...

1, Hardware 1. Sensor: hydraulic sensor, 12vDC, RS485 data output, Modbus protocol communication2. Circuit: according to the sensor properties, the circuit is mainly composed of two parts, communication circuit and power supply (1) 485 circuit: because 485 is half duplex communication, it needs to control the transceiver, so it is simply desig ...

Exception capture 1. What is exception capture """ The program can continue to run if there is an exception in the process of program execution. Note: you don't need to use exception capture all the time. You should use it when you know that there may be an exception in a certain place and you don' ...

Function (subroutine, procedures) definition: Function is to encapsulate a set of statements with a name (function name). To execute this function, you only need to call its function name effect:   Easy to reuse a part of code and reduce duplicate code Easy to modify code and expand Keep the ...

What I learned this week In vector, sort() sorting problem of strings (compared by alphabet in order, the first priority is higher: ABC < ACB < BCA) Sort problem in array: (sort function scope is [begin, end], excluding the last bit) Static array: int a [10] = {9, 0, 1, 2, 3, 7, 4, 5, 8, 6}; ...

Summary of common categories (I) Object: java.lang.Object Object:Java All classes in (custom class, class provided by jdk) inherit from object (all root classes) public int hashCode() returns the hash code value of the object (the hash code value of each object in memory is different). It has a relat ...

Python commonly used modules are calendar time datetime timeit os shutil zip math string Theoretically, all the above modules should be imported first, and string is a special case calendar, time, datetime refer to Chinese meaning calendar Calendar related modules Import before use import calen ...

1, Set the value of the specified key Commands: set Format: set key value 127.0.0.1:6379> set test_key test_value OK 2, Get the value of the specified key Command: get Format: get key 127.0.0.1:6379> get test_key "test_value" 3, For the string value stored in key, obtain the substring in the specified interval Command: ...

String is a class provided by the system, represented by string Here are some common methods about String for your reference: 1. Access It can be divided into two types: finding the charat in the string according to the index and finding the index of the character in the string according to the position of the character in the string publi ...

By default, std::cin/std::cout is a very slow input/output mode, and scanf/printf is much faster than std::cin/std::cout. But why?Is there any way to solve the problem of slow input and output? Close Sync/Unbind std::ios::sync_with_stdio(false) This function is a "whether stdio is compatible" switch. C++ in order to be compatibl ...