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  string str = to_string(2022 + 23);
  cout << "str = " << str << endl;

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  // char指標陣列
#include <iostream>
using namespace std;
int main() {
  char* arr[10];
  arr[0] = (char*)"test";
  arr[1] = (char*)"/123";
  cout << "arr[0] = " << arr[0] << endl;
  cout << "arr[1] = " << arr[1] << endl;
  return 0;
}

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  const string title = "被討厭的勇氣";
  char* s = new char[100];
  strcpy(s, title.c_str());
  cout << "s = " << s << endl;

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#include <iostream>
#include <cstring>
using namespace std;
int main() {
  // 有const char*
  const char* c_s1 = "Hello world!";
  // 沒const char*
  char* c_s2 = " Hi! Mary!";
  // 把其中一個char*變成string，就可以套用operator+= (const char* s)
  string s1 = string(c_s1) + c_s2;
  cout << "s1 = " << s1 << endl;
  return 0;
}