C++ String Processing example

C/C++ 문자열 처리의 예( length(), find(), find_last_of(), substr(), c_str(), atoi() )

#include <stdlib.h>
#include <iostream>
#include <string>

using namespace std;

int main() 
{
   string s1("A-123456-654123");

   int len = s1.length();
   cout << len << endl;								// 15

   char initial = s1[0];
   cout << initial << endl;							// A

   int idx1 = s1.find("-");
   cout << idx1 << endl;							// 1

   int idx2 = s1.find_last_of("-");
   cout << idx2 << endl;							// 8

   string token1 = s1.substr(idx1+1, idx2-idx1-1);
   cout << token1 << endl;							// 123456

   string token2 = s1.substr(idx2+1, len-idx2-1);
   cout << token2 << endl;							// 654123

   const char *pChar = token1.c_str(); // C 스타일 문자열로 변환
   int num = atoi(pChar);
   cout << num*2 << endl;							// 246912

   return 0;
}