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Asked: 2026-06-14T00:14:38+00:00

I have 2 words that taken as char* , I want insert them to

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I have 2 words that taken as char* , I want insert them to map<string,string> , thus I tried 2 ways and they didn’t work –

1st way –

#include <iostream>
#include <string>
#include <map>
using namespace std;
void main()
{
    map<string,string> myMap ; 
    char cWord[4] = "abc"; 
    char cValue[4] = "123";
    myMap.insert(cWord,cValue) ; 
}

I got an error – 

/usr/include/c++/4.4/bits/stl_tree.h: In member function ‘void std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_M_insert_unique(_II, _II) [with _InputIterator = char*, _Key = std::basic_string<char, std::char_traits<char>, std::allocator<char> >, _Val = std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, _KeyOfValue = std::_Select1st<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >, _Compare = std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, _Alloc = std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >]’:
/usr/include/c++/4.4/bits/stl_map.h:553:   instantiated from ‘void std::map<_Key, _Tp, _Compare, _Alloc>::insert(_InputIterator, _InputIterator) [with _InputIterator = char*, _Key = std::basic_string<char, std::char_traits<char>, std::allocator<char> >, _Tp = std::basic_string<char, std::char_traits<char>, std::allocator<char> >, _Compare = std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, _Alloc = std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >]’
testString.cpp:10:   instantiated from here
/usr/include/c++/4.4/bits/stl_tree.h:1324: error: no matching function for call to ‘std::_Rb_tree<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::_Select1st<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >, std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >::_M_insert_unique_(std::_Rb_tree_iterator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >, char&)’
/usr/include/c++/4.4/bits/stl_tree.h:1206: note: candidates are: std::_Rb_tree_iterator<_Val> std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_M_insert_unique_(std::_Rb_tree_const_iterator<_Val>, const _Val&) [with _Key = std::basic_string<char, std::char_traits<char>, std::allocator<char> >, _Val = std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, _KeyOfValue = std::_Select1st<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >, _Compare = std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, _Alloc = std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >]

2nd way – 

    // same include's as above ..
    map<string,string> myMap ; 
    // char* init ..    
    char cWord[4] = "abc"; 
    char cValue[4] = "123";

    // string ..
    string word(cWord) ; 
    string value(cValue) ; 
    myMap.insert(word,value) ;

I got an error –

error: ‘::main’ must return ‘int’
In file included from /usr/include/c++/4.4/map:60,
                 from testString2.cpp:3:
/usr/include/c++/4.4/bits/stl_tree.h: In member function ‘void std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_M_insert_unique(_II, _II) [with _InputIterator = std::basic_string<char, std::char_traits<char>, std::allocator<char> >, _Key = std::basic_string<char, std::char_traits<char>, std::allocator<char> >, _Val = std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, _KeyOfValue = std::_Select1st<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >, _Compare = std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, _Alloc = std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >]’:
/usr/include/c++/4.4/bits/stl_map.h:553:   instantiated from ‘void std::map<_Key, _Tp, _Compare, _Alloc>::insert(_InputIterator, _InputIterator) [with _InputIterator = std::basic_string<char, std::char_traits<char>, std::allocator<char> >, _Key = std::basic_string<char, std::char_traits<char>, std::allocator<char> >, _Tp = std::basic_string<char, std::char_traits<char>, std::allocator<char> >, _Compare = std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, _Alloc = std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >]’
testString2.cpp:15:   instantiated from here
/usr/include/c++/4.4/bits/stl_tree.h:1323: error: no match for ‘operator++’ in ‘++__first’
/usr/include/c++/4.4/bits/stl_map.h:553:   instantiated from ‘void std::map<_Key, _Tp, _Compare, _Alloc>::insert(_InputIterator, _InputIterator) [with _InputIterator = std::basic_string<char, std::char_traits<char>, std::allocator<char> >, _Key = std::basic_string<char, std::char_traits<char>, std::allocator<char> >, _Tp = std::basic_string<char, std::char_traits<char>, std::allocator<char> >, _Compare = std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, _Alloc = std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >]’
testString2.cpp:15:   instantiated from here
/usr/include/c++/4.4/bits/stl_tree.h:1324: error: no match for ‘operator*’ in ‘*__first’
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1 Answer

  1. Editorial Team
    #include <iostream>
#include <string>
#include <map>
using namespace std;
void main() //first mistake, it should be int main()
{
    map<string,string> myMap ; 
    char cWord[4] = "abc"; 
    char cValue[4] = "123";
    myMap.insert(cWord,cValue) ; //third mistake, char * != string.
    //and return 0;
}

    Rectification:

    #include <iostream>
#include <string>
#include <map>
using namespace std;
int main()
{
    map<string,string> myMap ; 
    string cWord = "abc", cValue = "123";
    myMap[cWord] = cValue ;
    return 0; 
}
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