expected primary-expression before '.' token

#include <iostream>
using namespace std;

int main(){
    string array[] = { "hej","hur","mar","du?" };
   
   
    string.join(array," "); // <-----

     cin.get();
    return 0;
}

#include <iostream>
#include <string>
#include <vector>

int main()
{
    std::vector<std::string> v;
    std::string res;
    int i, size;

    v.push_back("hej");
    v.push_back("san");

    size = v.size();
    for(i=0; i<size ; i++) {
        res.append(v[i]);
    }
    
    std::cout << "Result: " << res << std::endl;

    return 0;
}

#include <iostream>
#include <string>

int main()
{
    char *array[] = {"hej", "san", "!", NULL}, **cp;
    std::string res;

    for(cp = array; *cp != NULL ; cp++) {
        res.append(*cp);
    }

    std::cout << "Result: " << res << std::endl;

    return 0;
}

#include <iostream>
#include <string>

using namespace std;
int main ( int argc, char * argv[] )
{
       char enArray[3] = {'a', 'b', 'c'}; //Byt ut 3 mot antalet element du vill ha
       int lengthOfArray = sizeof(enArray);
       string slutString;

       for ( int i = 0; i < lengthOfArray; i++ )
       {
              slutString.push_back( enArray[i] );
       }
       cout << slutString; //Valfritt att visa stringen
       cin.get();
}

 

#include <string>
#include <algorithm>

int main() {

	using namespace std;

	char arr[3] = {'a', 'b', 'c'};
	string s;
	copy(arr, arr + (sizeof(arr)/sizeof(char)), inserter(s, s.begin()));
	
}