copy one string to another??

how to copy one string into another using LOOPS.(i am talking about default string class)??
the code given below does not work.
please teach me

Code:

void function(string str1)
{
   string str2;
   int i=0; 
   while(str1[i]!=NULL)
   {
      str2[i]=str1[i];
      i++;
   }
}

 

Your chosen approach is not the correct one. Simply use the assignment operator:

Code:

string str1="Hello";
string str2=str1;
cout<<str2;

Output should be "Hello".