求解，关于数组

#include <iostream>
#include <string>
int main()
{
using namespace std;
char fn[20];
string ln;
cout<<"Enter your first name: ";
cin.getline(fn,20);
cin.get();
cout<<"Enter your last name: ";
getline(cin,ln);
cin.get();
cout<<"Here`s the information in a single string: "
<<fn /*fn[20]结果会出错？*/ <<" , "<<ln<<endl;
return 0;
}