C++ String at()

str.at(pos);

#include<iostream>
using namespace std;
int main()
{
string str = "Welcome to lidihuo tutorial";
cout<<"String contains :";
for(int i=0; i<str.length(); i++)
{
cout<<  str.at(i);
} 
cout<<'\n';
cout<<"String is shown again";
for(int j=0 ; j<str.length(); j++)
{
cout<< str[j];
}
return 0;
} 

String contains Welcome to lidihuo tutorial