C# Basic Tutorial (Strings)

Strings

문자열 연결 및 길이

string fullName = firstName + " " + lastName;
Console.WriteLine($"fullName = {fullName}, " +
                    $"length = {fullName.Length}");

소문자로 변경

Console.WriteLine($"Lower fullName  = {fullName.ToLower()}, " +
                    $"length = {fullName.Length}");

대문자로 변경

Console.WriteLine($"Upper fullName  = {fullName.ToUpper()}, " +
                    $"length = {fullName.Length}");

문자열 분리

Console.WriteLine($"firstName = {fullName.Split(' ', StringSplitOptions.RemoveEmptyEntries)[0]}, " +
                    $"lastName = {fullName.Split(' ', StringSplitOptions.RemoveEmptyEntries)[1]}");

문자열 탐색

Console.WriteLine(fullName[0]); // d
Console.WriteLine(fullName[1]); // a
Console.WriteLine(fullName[2]); // v
Console.WriteLine(fullName[3]); // i
Console.WriteLine(fullName[4]); // d

Console.WriteLine(fullName.IndexOf('i')); // 3  (i 의 첫번째 인덱스 위치)
Console.WriteLine(fullName.IndexOfAny("zi".ToArray())); //3 (zi 중 발견된 char 의 첫번째 인덱스 위치)

특수문자

// 특수문자를 입력하기 위해서는 \ 를 특수문자 앞에 넣으면 된다.
string specialFullname = fullName + " \"My friend\" ";
Console.WriteLine(specialFullname); // david anderson "My friend"
specialFullname = fullName + " \'My friend\' ";
Console.WriteLine(specialFullname); // david anderson 'My friend'
specialFullname = fullName + " \\My friend\\ ";
Console.WriteLine(specialFullname); // david anderson \My friend\

포멧 , Interpolation

Console.WriteLine(string.Format("my first name is {0}, my last name is {1} ", firstName, lastName));
Console.WriteLine($"my first name is {firstName}, my last name is {lastName} ");

문자열로 변경

int number = 10;
bool result = false;
DateTime dateTime = DateTime.Now;

Console.WriteLine(number.ToString());
Console.WriteLine(result.ToString());
Console.WriteLine(dateTime.ToString());

관련영상

https://youtu.be/pcYScyStbJo

 

Git

https://github.com/yogingang/CSharpBasicTutorial