12. Strings and regular expressions

Use regular expressions Related knowledge about regular expressions When writing programs or web pages that process strings, you often need to find strings that conform to some complex rules. Regular expressions are tools used to describe these rules. In other words, regular expressions are a tool. Defines the matching pattern of a string (how to […]

C++ double to string

#include “iomanip” #include <iostream> using namespace std; bool to_int(double value,int & amp; res){ res=int(value); //If the result is min_int/max_int, there is a high probability that the value exceeds the limit, unless the value is exactly equal to 2147483647/-2147483648 return (res > -2147483648 & amp; & amp; res < 2147483647); } string double_to_string(double value,int decimal,bool append_zero) […]

8. Data structure-string, encoding set

Coding table Chinese coding table ? Mapping of numbers to Chinese single characters. Chinese characters can only use multi-byte 2 bytes, and there are always 65535 states. Common Chinese encodings include GB2312, GBK, GB18030, and BIG 5. ? All encoding tables are compatible with single-byte ASCII tables. UNICODE ? Multi-byte, one encoding table solves the […]

Java–Date string usage

Operation string dates, etc. 1. String concatenation public class Test { public static void main1(String[] args) { String str1 = “hello,”; String str2 = “my name is Tom!”; String str3 = str1 + str2; System.out.println(str3); } //The running results are as follows: // hello, my name is Tom! public static void main2(String[] args) { System.out.println(10 […]

C++ optimizes the use of strings

String properties Strings are dynamically allocated Strings are values Strings are copied a lot String optimization Basic optimization Compound assignment operations avoid temporary strings Allocate memory in advance Use constant references to reduce temporary objects generated when passing parameters Eliminate copying of the returned string C-style optimization: use character arrays instead of strings Algorithm optimization: […]

Implementation of string functions

Implementation of string functions One: strlen()—-calculate the string size Write strlen first, because it will be used by several functions later. code show as below: #define _CRT_SECURE_NO_WARNINGS #include<stdio.h> int my_strlen(char* arr) {<!– –> int sum = 0, i = 0; while (*arr != ‘\0’) {<!– –> sum + + ; arr + + ; } […]

C detailed string functions

But on the road ahead, don’t ask about your return date It should be noted that to use the functions mentioned below, you must include the header file Article directory strlen strcpy strncpy strcat strncat strcmp strncmp strstr strtok strerror String case conversion strupr strlwr memcpy memmove memcmp strlen Find the length of a string […]

2.3 Windows driver development: kernel string conversion method

In kernel programming, strings have two formats: ANSI_STRING and UNICODE_STRING. These two formats are safe versions of string structures introduced by Microsoft and are also formats recommended by Microsoft. , usually the type represented by ANSI_STRING is char *, which is a string in multi-byte mode of ANSI, and UNICODE_STRING represents wchar*, which is a […]

A comprehensive summary of new string manipulation methods in JS+ES6, a total of forty-seven methods

Let me introduce to you how to operate strings. Most of what you know and don’t know is here! The classification may be a little wrong, please forgive me! Added 1.concat() Splicing strings can concatenate two or more strings let str = “hello” let str1 = “str” console.log(“hello”.concat(str1)) //hello str console.log(str.concat(str1)) //hello str 2.padStart(total length, […]