c++ - How do I fix these "Undefined Reference" errors in Ubuntu? -


g++ 4.7.

to fix debug error, added -std=c++11 build command. i'm getting ton of "undefined reference" errors one:

'in function encrypt(std::string&, int)': /home/bob/workspace/new/debug /../test.cpp:10: undefined reference std::string::begin()' /home/bob/workspace/new/debug/../test.cpp:10: undefined reference std::string::end()' ./test.o: in function main': /home/bob/workspace/new/debug/../test.cpp:24: undefined reference `std::basic_string, std::allocator >::basic_string()'" '

what need fix ? here's code 

#include <iostream> #include <string> using namespace std;  void encrypt(std::string &iostr, int key) { key %= 26; int ch;  (auto &it : iostr) { ch = tolower(it); if (!islower(ch)) { continue; } ch += key; if (ch > 'z') { ch -= 26; } = ch; } }  int main() { string source; int key = 1; cout << "paste cyphertext , press enter shift each letter right 1";  getline(cin, source); encrypt(source, key);  cout << source << "";    encrypt(source, key); cout << source << endl; cout << "press enter exit"; cin.ignore(cin.rdbuf()->in_avail() + 1);  return 0;  }


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