/in/call.cpp:8:5: error: unknown type name 'string'; did you mean 'std::string'?
    string name;
    ^~~~~~
    std::string
/usr/bin/../lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/bits/stringfwd.h:74:33: note: 'std::string' declared here
  typedef basic_string<char>    string;   
                                ^
/in/call.cpp:9:5: error: unknown type name 'string'; did you mean 'std::string'?
    string status;
    ^~~~~~
    std::string
/usr/bin/../lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/bits/stringfwd.h:74:33: note: 'std::string' declared here
  typedef basic_string<char>    string;   
                                ^
/in/call.cpp:16:5: error: use of undeclared identifier 'cin'; did you mean 'std::cin'?
    cin >> CallNum;
    ^~~
    std::cin
/usr/bin/../lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/iostream:60:18: note: 'std::cin' declared here
  extern istream cin;           /// Linked to standard input
                 ^
/in/call.cpp:20:9: error: use of undeclared identifier 'cin'; did you mean 'std::cin'?
        cin >> AllCall[i].tick >> AllCall[i].name >> AllCall[i].status >> AllCall[i].duration;
        ^~~
        std::cin
/usr/bin/../lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/iostream:60:18: note: 'std::cin' declared here
  extern istream cin;           /// Linked to standard input
                 ^
/in/call.cpp:31:9: error: use of undeclared identifier 'cout'; did you mean 'std::cout'?
        cout << "Starting tick #" << tick << endl;
        ^~~~
        std::cout
/usr/bin/../lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/iostream:61:18: note: 'std::cout' declared here
  extern ostream cout;          /// Linked to standard output
                 ^
/in/call.cpp:31:46: error: use of undeclared identifier 'endl'; did you mean 'std::endl'?
        cout << "Starting tick #" << tick << endl;
                                             ^~~~
                                             std::endl
/usr/bin/../lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/ostream:590:5: note: 'std::endl' declared here
    endl(basic_ostream<_CharT, _Traits>& __os)
    ^
/in/call.cpp:37:17: error: use of undeclared identifier 'cout'; did you mean 'std::cout'?
                cout << "Call from " << AllCall[i].name << " a " << AllCall[i].status << " member" << endl;
                ^~~~
                std::cout
/usr/bin/../lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/iostream:61:18: note: 'std::cout' declared here
  extern ostream cout;          /// Linked to standard output
                 ^
/in/call.cpp:37:103: error: use of undeclared identifier 'endl'; did you mean 'std::endl'?
                cout << "Call from " << AllCall[i].name << " a " << AllCall[i].status << " member" << endl;
                                                                                                      ^~~~
                                                                                                      std::endl
/usr/bin/../lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/ostream:590:5: note: 'std::endl' declared here
    endl(basic_ostream<_CharT, _Traits>& __os)
    ^
/in/call.cpp:62:17: error: use of undeclared identifier 'cout'; did you mean 'std::cout'?
                cout << "Answering call from " << call->name << endl;
                ^~~~
                std::cout
/usr/bin/../lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/iostream:61:18: note: 'std::cout' declared here
  extern ostream cout;          /// Linked to standard output
                 ^
/in/call.cpp:62:65: error: use of undeclared identifier 'endl'; did you mean 'std::endl'?
                cout << "Answering call from " << call->name << endl;
                                                                ^~~~
                                                                std::endl
/usr/bin/../lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/ostream:590:5: note: 'std::endl' declared here
    endl(basic_ostream<_CharT, _Traits>& __os)
    ^
/in/call.cpp:68:17: error: use of undeclared identifier 'cout'; did you mean 'std::cout'?
                cout << "Answering call from " << call->name << endl;
                ^~~~
                std::cout
/usr/bin/../lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/iostream:61:18: note: 'std::cout' declared here
  extern ostream cout;          /// Linked to standard output
                 ^
/in/call.cpp:68:65: error: use of undeclared identifier 'endl'; did you mean 'std::endl'?
                cout << "Answering call from " << call->name << endl;
                                                                ^~~~
                                                                std::endl
/usr/bin/../lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/ostream:590:5: note: 'std::endl' declared here
    endl(basic_ostream<_CharT, _Traits>& __os)
    ^
/in/call.cpp:74:17: error: use of undeclared identifier 'cout'; did you mean 'std::cout'?
                cout << "Answering call from " << call->name << endl;
                ^~~~
                std::cout
/usr/bin/../lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/iostream:61:18: note: 'std::cout' declared here
  extern ostream cout;          /// Linked to standard output
                 ^
/in/call.cpp:74:65: error: use of undeclared identifier 'endl'; did you mean 'std::endl'?
                cout << "Answering call from " << call->name << endl;
                                                                ^~~~
                                                                std::endl
/usr/bin/../lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/ostream:590:5: note: 'std::endl' declared here
    endl(basic_ostream<_CharT, _Traits>& __os)
    ^
/in/call.cpp:80:17: error: use of undeclared identifier 'cout'; did you mean 'std::cout'?
                cout << "Answering call from " << call->name << endl;
                ^~~~
                std::cout
/usr/bin/../lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/iostream:61:18: note: 'std::cout' declared here
  extern ostream cout;          /// Linked to standard output
                 ^
/in/call.cpp:80:65: error: use of undeclared identifier 'endl'; did you mean 'std::endl'?
                cout << "Answering call from " << call->name << endl;
                                                                ^~~~
                                                                std::endl
/usr/bin/../lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/ostream:590:5: note: 'std::endl' declared here
    endl(basic_ostream<_CharT, _Traits>& __os)
    ^
16 errors generated.
/in/Compile/Makefile:39: recipe for target 'buildCall' failed
make: *** [buildCall] Error 1