append concept

 #include<iostream>

using namespace std;

int main()

{

string str="help";

cout<<"\nOriginal string :"<<str<<endl;

str.append("desk");

cout<<"\nstring after append:"<<str;

str.assign("helpmode");

cout<<"\n\nstring after assign:"<<str;

cout<<"charctor of 3rd variable is:"<<str.at(3);

return 0;

}