//========================================
 
#include<iostream>
 
using namespace std;
 
//========================================
 
int main()
 
{
 
 string str1="I like C++";
 
 string str2=",I like the world.";
 
 string str3="Hello";
 
 string str4("Hi");
 
 //====================================
 
 str1.append(str2);
 
 str3.append(str2, 11, 7);
 
 str4.append(5, '.');
 
 //====================================
 
 cout<<str1<<endl;
 
 cout<<str3<<endl;
 
 cout<<str4<<endl;
 
 system("pause");
 
 return 0; 
 
}
 
//========================================

I like C++,I like the world.
Hello World.
Hi.....