#include
#include
using namespace std;
int main()
{
string s1( "cat" ), s2, s3;
s2 = s1;
s3.assign( s1 );
cout << "s1: " << s1 << "\ns2: " << s2 << "\ns3: "
<< s3 << "\n\n";
// demonstrating member function at()
int len = s3.length();
for ( int x = 0; x < len; ++x )
cout << s3.at( x );
return 0;
}