string_test.cpp

#include <iostream>
#include <string>
using namespace std;

int main(void) {
  string s("abc\0abc");
  cout << s.length() << endl; // 3
  cout << distance(s.begin(), s.end()) << endl; // 3

  string t("abcdabc");
  cout << t.length() << endl; // 7
  cout << distance(t.begin(), t.end()) << endl; // 7

  t[3] = '\0';
  cout << t.length() << endl; // 7
  cout << distance(t.begin(), t.end()) << endl; // 7
}