Xcode doesn't let me initialize values in C++ -

i'm using stroustrup's book programming -- principles , practice using c++ pick c++. 1 of topics regards initializing variables. consider following example in book:

#include <iostream> #include "std_lib_facilities.h"  int main() {     cout << "please enter first_name , age\n";     string first_name = "???"; // string variable     // ("???" means "don't know name")     int age = -1;              // integer variable (-1 means "don't know age")     cin >> first_name >> age;  // read string followed integer     cout << "hello, " << first_name << " (age " << age << ")\n"; } 

in code, variable age supposed initialized -1. however, in xcode, when tried build , run it, age set 0 when typed in that's not integer age. example, if type in "22 carlos", script returns 0 age. according book, i'm supposed see -1.

i'm using xcode ide. have ide?