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    #include <iostream>
    #define STEK_SIZE 512
    using namespace std;
 
 
 
 
    template <typename uniVar>
    class stek{
    private:
        uniVar st[STEK_SIZE];
        int pos;
    public:
        bool operator << (uniVar &val){
            if(pos+1 < STEK_SIZE){
                st[++pos] = val;
                return true;
            }else{
                return false;
            }
        }
 
        bool operator >> (uniVar &val){
            if(pos > -1){
                val = st[pos--];
                return true;
            }else{
                return false;
            }
        } 
        friend bool operator << <>(uniVar &val, stek &ob);     
        friend bool operator >> <>(uniVar &val, stek &ob);
        stek(){
            pos = -1;    
        }
    };
 
    template <typename uniVar>          
    bool operator >> (uniVar &val, stek &ob){
            if(ob.pos+1 < STEK_SIZE){
                ob.st[++ob.pos] = val;
                return true;
            }else{
                return false;
            }
    }
 
    template <typename uniVar>          
    bool operator << (uniVar &val, stek &ob){
            if(ob.pos > -1){
                val = ob.st[ob.pos--];
                return true;
            }else{
                return false;
            }
    }
 
 
    int main(){
    char sym;    
    char buffer[] = "hello world";
        stek<char> Stek;
 
        Stek << buffer[10];
        Stek << buffer[9];
        Stek << buffer[8];
        Stek << buffer[7];
        Stek << buffer[6];
        Stek << buffer[5];
        Stek << buffer[4];
        Stek << buffer[3];
        Stek << buffer[2];
        buffer[1] >> Stek;
        buffer[0] >> Stek;
        while(Stek >> sym){
            cout << sym;
        }
        cout << endl;
        cout << "C++ work" << endl;
        return 0;
    }

prog.cpp:31:30: error: declaration of ‘operator<<’ as non-function
         friend bool operator << <>(uniVar &val, stek &ob);
                              ^~
prog.cpp:31:30: error: expected ‘;’ at end of member declaration
prog.cpp:31:33: error: expected unqualified-id before ‘<’ token
         friend bool operator << <>(uniVar &val, stek &ob);
                                 ^
prog.cpp:32:30: error: declaration of ‘operator>>’ as non-function
         friend bool operator >> <>(uniVar &val, stek &ob);
                              ^~
prog.cpp:32:30: error: expected ‘;’ at end of member declaration
prog.cpp:32:33: error: expected unqualified-id before ‘<’ token
         friend bool operator >> <>(uniVar &val, stek &ob);
                                 ^
prog.cpp:39:36: error: ‘stek’ is not a type
     bool operator >> (uniVar &val, stek &ob){
                                    ^~~~
prog.cpp: In function ‘bool operator>>(uniVar&, int&)’:
prog.cpp:40:19: error: request for member ‘pos’ in ‘ob’, which is of non-class type ‘int’
             if(ob.pos+1 < STEK_SIZE){
                   ^~~
prog.cpp:41:20: error: request for member ‘st’ in ‘ob’, which is of non-class type ‘int’
                 ob.st[++ob.pos] = val;
                    ^~
prog.cpp:41:28: error: request for member ‘pos’ in ‘ob’, which is of non-class type ‘int’
                 ob.st[++ob.pos] = val;
                            ^~~
prog.cpp: At global scope:
prog.cpp:49:36: error: ‘stek’ is not a type
     bool operator << (uniVar &val, stek &ob){
                                    ^~~~
prog.cpp: In function ‘bool operator<<(uniVar&, int&)’:
prog.cpp:50:19: error: request for member ‘pos’ in ‘ob’, which is of non-class type ‘int’
             if(ob.pos > -1){
                   ^~~
prog.cpp:51:26: error: request for member ‘st’ in ‘ob’, which is of non-class type ‘int’
                 val = ob.st[ob.pos--];
                          ^~
prog.cpp:51:32: error: request for member ‘pos’ in ‘ob’, which is of non-class type ‘int’
                 val = ob.st[ob.pos--];
                                ^~~
prog.cpp: In function ‘int main()’:
prog.cpp:73:19: error: no match for ‘operator>>’ (operand types are ‘char’ and ‘stek<char>’)
         buffer[1] >> Stek;
         ~~~~~~~~~~^~~~~~~
prog.cpp:39:10: note: candidate: template<class uniVar> bool operator>>(uniVar&, int&)
     bool operator >> (uniVar &val, stek &ob){
          ^~~~~~~~
prog.cpp:39:10: note:   template argument deduction/substitution failed:
prog.cpp:73:22: note:   cannot convert ‘Stek’ (type ‘stek<char>’) to type ‘int&’
         buffer[1] >> Stek;
                      ^~~~
In file included from /usr/include/c++/6/iostream:40:0,
                 from prog.cpp:1:
/usr/include/c++/6/istream:924:5: note: candidate: template<class _CharT, class _Traits, class _Tp> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&&, _Tp&)
     operator>>(basic_istream<_CharT, _Traits>&& __is, _Tp& __x)
     ^~~~~~~~
/usr/include/c++/6/istream:924:5: note:   template argument deduction/substitution failed:
prog.cpp:73:22: note:   mismatched types ‘std::basic_istream<_CharT, _Traits>’ and ‘char’
         buffer[1] >> Stek;
                      ^~~~
In file included from /usr/include/c++/6/iostream:40:0,
                 from prog.cpp:1:
/usr/include/c++/6/istream:808:5: note: candidate: template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, signed char*)
     operator>>(basic_istream<char, _Traits>& __in, signed char* __s)
     ^~~~~~~~
/usr/include/c++/6/istream:808:5: note:   template argument deduction/substitution failed:
prog.cpp:73:22: note:   mismatched types ‘std::basic_istream<char, _Traits>’ and ‘char’
         buffer[1] >> Stek;
                      ^~~~
In file included from /usr/include/c++/6/iostream:40:0,
                 from prog.cpp:1:
/usr/include/c++/6/istream:803:5: note: candidate: template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, unsigned char*)
     operator>>(basic_istream<char, _Traits>& __in, unsigned char* __s)
     ^~~~~~~~
/usr/include/c++/6/istream:803:5: note:   template argument deduction/substitution failed:
prog.cpp:73:22: note:   mismatched types ‘std::basic_istream<char, _Traits>’ and ‘char’
         buffer[1] >> Stek;
                      ^~~~
In file included from /usr/include/c++/6/iostream:40:0,
                 from prog.cpp:1:
/usr/include/c++/6/istream:761:5: note: candidate: template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, signed char&)
     operator>>(basic_istream<char, _Traits>& __in, signed char& __c)
     ^~~~~~~~
/usr/include/c++/6/istream:761:5: note:   template argument deduction/substitution failed:
prog.cpp:73:22: note:   mismatched types ‘std::basic_istream<char, _Traits>’ and ‘char’
         buffer[1] >> Stek;
                      ^~~~
In file included from /usr/include/c++/6/iostream:40:0,
                 from prog.cpp:1:
/usr/include/c++/6/istream:756:5: note: candidate: template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, unsigned char&)
     operator>>(basic_istream<char, _Traits>& __in, unsigned char& __c)
     ^~~~~~~~
/usr/include/c++/6/istream:756:5: note:   template argument deduction/substitution failed:
prog.cpp:73:22: note:   mismatched types ‘std::basic_istream<char, _Traits>’ and ‘char’
         buffer[1] >> Stek;
                      ^~~~
In file included from /usr/include/c++/6/istream:934:0,
                 from /usr/include/c++/6/iostream:40,
                 from prog.cpp:1:
/usr/include/c++/6/bits/istream.tcc:923:5: note: candidate: template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, _CharT&)
     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c)
     ^~~~~~~~
/usr/include/c++/6/bits/istream.tcc:923:5: note:   template argument deduction/substitution failed:
prog.cpp:73:22: note:   mismatched types ‘std::basic_istream<_CharT, _Traits>’ and ‘char’
         buffer[1] >> Stek;
                      ^~~~
In file included from /usr/include/c++/6/istream:934:0,
                 from /usr/include/c++/6/iostream:40,
                 from prog.cpp:1:
/usr/include/c++/6/bits/istream.tcc:955:5: note: candidate: template<class _CharT2, class _Traits2> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, _CharT2*)
     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s)
     ^~~~~~~~
/usr/include/c++/6/bits/istream.tcc:955:5: note:   template argument deduction/substitution failed:
prog.cpp:73:22: note:   mismatched types ‘std::basic_istream<_CharT, _Traits>’ and ‘char’
         buffer[1] >> Stek;
                      ^~~~
In file included from /usr/include/c++/6/string:53:0,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/bits/basic_string.tcc:1437:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
     operator>>(basic_istream<_CharT, _Traits>& __in,
     ^~~~~~~~
/usr/include/c++/6/bits/basic_string.tcc:1437:5: note:   template argument deduction/substitution failed:
prog.cpp:73:22: note:   mismatched types ‘std::basic_istream<_CharT, _Traits>’ and ‘char’
         buffer[1] >> Stek;
                      ^~~~
prog.cpp:74:19: error: no match for ‘operator>>’ (operand types are ‘char’ and ‘stek<char>’)
         buffer[0] >> Stek;
         ~~~~~~~~~~^~~~~~~
prog.cpp:39:10: note: candidate: template<class uniVar> bool operator>>(uniVar&, int&)
     bool operator >> (uniVar &val, stek &ob){
          ^~~~~~~~
prog.cpp:39:10: note:   template argument deduction/substitution failed:
prog.cpp:74:22: note:   cannot convert ‘Stek’ (type ‘stek<char>’) to type ‘int&’
         buffer[0] >> Stek;
                      ^~~~
In file included from /usr/include/c++/6/iostream:40:0,
                 from prog.cpp:1:
/usr/include/c++/6/istream:924:5: note: candidate: template<class _CharT, class _Traits, class _Tp> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&&, _Tp&)
     operator>>(basic_istream<_CharT, _Traits>&& __is, _Tp& __x)
     ^~~~~~~~
/usr/include/c++/6/istream:924:5: note:   template argument deduction/substitution failed:
prog.cpp:74:22: note:   mismatched types ‘std::basic_istream<_CharT, _Traits>’ and ‘char’
         buffer[0] >> Stek;
                      ^~~~
In file included from /usr/include/c++/6/iostream:40:0,
                 from prog.cpp:1:
/usr/include/c++/6/istream:808:5: note: candidate: template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, signed char*)
     operator>>(basic_istream<char, _Traits>& __in, signed char* __s)
     ^~~~~~~~
/usr/include/c++/6/istream:808:5: note:   template argument deduction/substitution failed:
prog.cpp:74:22: note:   mismatched types ‘std::basic_istream<char, _Traits>’ and ‘char’
         buffer[0] >> Stek;
                      ^~~~
In file included from /usr/include/c++/6/iostream:40:0,
                 from prog.cpp:1:
/usr/include/c++/6/istream:803:5: note: candidate: template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, unsigned char*)
     operator>>(basic_istream<char, _Traits>& __in, unsigned char* __s)
     ^~~~~~~~
/usr/include/c++/6/istream:803:5: note:   template argument deduction/substitution failed:
prog.cpp:74:22: note:   mismatched types ‘std::basic_istream<char, _Traits>’ and ‘char’
         buffer[0] >> Stek;
                      ^~~~
In file included from /usr/include/c++/6/iostream:40:0,
                 from prog.cpp:1:
/usr/include/c++/6/istream:761:5: note: candidate: template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, signed char&)
     operator>>(basic_istream<char, _Traits>& __in, signed char& __c)
     ^~~~~~~~
/usr/include/c++/6/istream:761:5: note:   template argument deduction/substitution failed:
prog.cpp:74:22: note:   mismatched types ‘std::basic_istream<char, _Traits>’ and ‘char’
         buffer[0] >> Stek;
                      ^~~~
In file included from /usr/include/c++/6/iostream:40:0,
                 from prog.cpp:1:
/usr/include/c++/6/istream:756:5: note: candidate: template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, unsigned char&)
     operator>>(basic_istream<char, _Traits>& __in, unsigned char& __c)
     ^~~~~~~~
/usr/include/c++/6/istream:756:5: note:   template argument deduction/substitution failed:
prog.cpp:74:22: note:   mismatched types ‘std::basic_istream<char, _Traits>’ and ‘char’
         buffer[0] >> Stek;
                      ^~~~
In file included from /usr/include/c++/6/istream:934:0,
                 from /usr/include/c++/6/iostream:40,
                 from prog.cpp:1:
/usr/include/c++/6/bits/istream.tcc:923:5: note: candidate: template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, _CharT&)
     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c)
     ^~~~~~~~
/usr/include/c++/6/bits/istream.tcc:923:5: note:   template argument deduction/substitution failed:
prog.cpp:74:22: note:   mismatched types ‘std::basic_istream<_CharT, _Traits>’ and ‘char’
         buffer[0] >> Stek;
                      ^~~~
In file included from /usr/include/c++/6/istream:934:0,
                 from /usr/include/c++/6/iostream:40,
                 from prog.cpp:1:
/usr/include/c++/6/bits/istream.tcc:955:5: note: candidate: template<class _CharT2, class _Traits2> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, _CharT2*)
     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s)
     ^~~~~~~~
/usr/include/c++/6/bits/istream.tcc:955:5: note:   template argument deduction/substitution failed:
prog.cpp:74:22: note:   mismatched types ‘std::basic_istream<_CharT, _Traits>’ and ‘char’
         buffer[0] >> Stek;
                      ^~~~
In file included from /usr/include/c++/6/string:53:0,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/bits/basic_string.tcc:1437:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
     operator>>(basic_istream<_CharT, _Traits>& __in,
     ^~~~~~~~
/usr/include/c++/6/bits/basic_string.tcc:1437:5: note:   template argument deduction/substitution failed:
prog.cpp:74:22: note:   mismatched types ‘std::basic_istream<_CharT, _Traits>’ and ‘char’
         buffer[0] >> Stek;
                      ^~~~

Standard output is empty