DaniWeb Forum Index > Software Development > C++

stl/map and string question

Please support our C++ advertiser: Intel Parallel Studio Home

•

Join Date: Nov 2008

Posts: 80

Reputation: drjay1627 is an unknown quantity at this point

Solved Threads: 1

drjay1627

Offline

Junior Poster in Training

stl/map and string question

Nov 30th, 2008

I have string and a map<string,int>

i need to iterate through the map and find string[i] and replace the int with the string.

eg: if map contains

hello 6
world 4
its 3
me 60

if the string is "its me hello world world hello"

output should be "3 60 6 4 4 6"

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
for(int i = 0 ; i < str.length() ; i++){
         it = mymap.find(str[i]); //it is iterator, mymap is map<string,int> 
          myOutfile << (*it).second; //myOutfile is out stream
        }
for(int i = 0 ; i < str.length() ; i++){
         it = mymap.find(str[i]); //it is iterator, mymap is map<string,int> 
          myOutfile << (*it).second; //myOutfile is out stream
        }

i also tried

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
 for(itStr its = str.begin() ; its < str.end(); its++ ){
            itf = myMap.find(*its);
            myOutfile << (*itf).second;
        }
 for(itStr its = str.begin() ; its < str.end(); its++ ){
            itf = myMap.find(*its);
            myOutfile << (*itf).second;
        }

i get the same error

main.cpp:294: error: invalid conversion from `char' to `const char*'
main.cpp:294: error: initializing argument 1 of `std::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>]'

can someone please help me fix this!

thanks

drjay

•

Join Date: Jul 2008

Posts: 2,001

Reputation: ArkM has much to be proud of

Solved Threads: 343

ArkM

Offline

Postaholic

Re: stl/map and string question

Nov 30th, 2008

Regrettably both code snippets are absolutely senseless.
May be better post us your map building code? Is its quality the same?
You need to iterate a source string word by word, not a map. You must get WORDS from the source string, not chars. Use istringstream to extract words from the source string...

Last edited by ArkM; Nov 30th, 2008 at 2:35 pm.