C++에서 Left Right Mid Trim함수 사용하기

C++에서 Left Right Mid Trim함수 사용하기이다.

#include <string>
#include <iostream>

using namespace std;

string Left(const string &Text, int TextLength) {
       string ConvertText;

       if (Text.size() < TextLength) {
              TextLength = Text.size();
       }

       ConvertText = Text.substr(0, TextLength);
       return ConvertText;
}

string Right(const string &Text, int TextLength) {
       string ConvertText;

       if (Text.size() < TextLength) {
              TextLength = Text.size();
       }

       ConvertText = Text.substr(Text.size() - TextLength, TextLength);
       return ConvertText;
}

string Mid(const string &Text, int Startint, int Endint) {
       string ConvertText;

       if (Startint < Text.size() || Endint < Text.size()) {
               ConvertText = Text.substr(Startint, Endint);
               return ConvertText;
       }
       else {
              return Text;
       }
}

string trim(string& str) {
    str.erase(0, str.find_first_not_of(' '));         //prefixing spaces
    str.erase(str.find_last_not_of(' ') + 1);         //surfixing spaces
    return str;
}

// source url https://stackoverflow.com/questions/5343190/how-do-i-replace-all-instances-of-a-string-with-another-string

string ReplaceString(string subject, const string& search,
                          const string& replace) {
    size_t pos = 0;
    while ((pos = subject.find(search, pos)) != string::npos) {
         subject.replace(pos, search.length(), replace);
         pos += replace.length();
    }
    return subject;
}


int main() {

       // string spaces(20, ' '); repeat 20 spaces
       // split & join
       // check if it is a number string like -123.45

       const char *longString = R""""(
             This is 
             a very 
             long 
             string
       )"""";

       const string str2 = R"(
             "Hello?
              It's been a long time.
              How are you doing?
              I'm doing pretty good.
              And you?"
              https://m.blog.naver.com/PostView.naver?isHttpsRedirect=true&blogId=killerq6434&logNo=90017206835
              https://m.blog.naver.com/PostView.naver?blogId=killerq6434&logNo=90180563211&navType=tl
              https://www.youtube.com/watch?v=QHalO6LU7w0
       )";

       string num1 = "          1         2         3         4";
       string num2 = "012345678901234567890123456789012345678901";
       string test = "Hello, C# is a great programming language.";

       string l5 = Left(test, 5);
       string r9 = Right(test, 9);
       string m155 = Mid(test, 15, 5);

       cout << "\n" << num1 << std::endl;
       cout << num2 << std::endl;

       cout << test << "\n" << std::endl;
       cout << "Left 5 chars: \"" << l5 << "\"" << std::endl;
       cout << "Right 9 chars: \"" << r9 << "\"" << std::endl;
       cout << "Mid 5 chars from the position 15: \"" << m155 << "\"" << "\n\n";

       string str = "             가나다라마바사";
       cout << "Original: [" << str << "]" << endl;
       trim(str);
       cout << "Trimmed: [" << str << "]" << "\n\n";


       string a="What a nice day it is? What a nice day it is? What a nice day it is?";

       cout << "Original: [" << a << "\n";
       cout << "Replaced: [" << ReplaceString(a, "day", "") << "\n\n";

       cout << longString << "\n\n";
       cout << str2 << "\n\n";

       return 0;

}