trouble outputing string object to screen.

Code:

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void ListFileMem(StudentRecord** Records, int numRecords){
        cout<<"LIST RECORDS FROM MEMORY";
        string fullname, firstname, lastname;
        if (numRecords>0)
        {
                for (int k=0; k<numRecords;k++)
                {
                        firstname=Records[k]->firstName;
                        firstname+=" ";
                        lastname=Records[k]->lastName;
                        fullname=firstname;
                        fullname+=lastname;
                        cout<< fullname; //compiler does not like this. why? //line 269
                        //cout<<"Record"<<k<<"\n\t"<<"Name: " << fullname;cout<<"\n\t"<<"ID:"<<Records[k]->id
                        //        <<"  "<<"Mark:"<<Records[k]->mark<<endl;;
                }
      }
        else
       
                cout<<"memory empty, unable to list\n";




}

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Code:

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getting error message from ms 2003 compiler:
n:\assignment0.cpp(269): error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'std::string' (or there is no acceptable conversion)

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what is wrong?

Quote:

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n:\assignment0.cpp(269):

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Where is line number 269? Post a short working example that demonstrates your problem.

>> binary '<<' : no operator found which takes a right-hand operand of type 'std::string'
You switched to string. Good choice. You have to #include <string> in the files that use it. Doing so will probably get rid of the error.