#include <iostream>
#include <algorithm>
using namespace std;
//string_length_pushback1.cpp
int main()
{
	string  str1, str2, str3, str4,str5, temp ;
		str1= "Hello World";
		str4="My Six Bullets ";
		//iterators 
		 string::iterator sit;
		// 
		 unsigned int i; 
		 i = str1.length();
		 cout<<"\n str1 : "<< str1 ;
		 cout<<"\n length of str1 : "<< i <<endl; 
		  cout <<" Origianl str4 :\n\t"<< str4 ; 
		   i = str4.length();
		   cout<<"\n original length of str4: "<< i <<endl; 
	
	 cout<<" string::iteration of str1 \n \t"; 
	 for(sit =str1.begin(); sit!=str1.end(); sit++)
	 	       { 
		 		cout<< *sit;   
		 		str4.push_back(*sit); 
				 
		       }
	
	 cout<< "\n final str4 :\n\t"<< str4 ; 
     i = str4.length();
     cout<<"\n Final length of str4: "<< i <<endl; 
		return 0; 
}