C++ rand() not working with string array - c++

Question

I'm creating a small program that allows the user to input 3 names (or whatever string they want). The program should then display all three strings (which is working), then it should use the rand() function to randomly display one of the three strings. This is the part that isn't functioning properly.
#include <iostream>
#include <string>
using namespace std;
void display(string[], int);
const int SIZE = 3;
int main()
{
string names[SIZE];
for (int i = 0; i < SIZE; i++)
{
cout << i + 1 << ": ";
getline(cin, names[i]);
}
cout << endl;
display(names, SIZE);
int name = rand() % (2 + 1 - 0) + 0;
cout << names[name];
cin.get();
return 0;
}
void display(string nm[], int n)
{
int i = 0;
for (i; i < n; i++)
{
cout << "Name " << i + 1 << ": ";
cout << nm[i] << endl;
}
}
I had it set up differently before, and it gave me an error, but after changing it to what it is now, it always gives me the last element [2].
Is this a code error, or is it just that rand() always gives the same output on the same system?

Answer 1

After some discussion in the comments, it became apparent that the issue was that I was not seeding the rand() function. Below is part of the code that was not functioning, corrected.
(Also, as a sidenote, to use the time() function, <ctime> or <time.h> has to be included.)
srand(time(NULL));
int name = rand() % 3;
cout << names[name];
(Thanks to #manni66 for pointing out that it was useless to include an overly complicated calculation to get the range for rand(), as it just had to be a single integer.

Answer 2

seeding with current time works :
#include <iostream>
#include <string>
#include <cstdlib>
#include <ctime>
#include <cstdio>
using namespace std;
void display(string[], int);
const int SIZE = 3;
int main()
{
string names[SIZE];
for (int i = 0; i < SIZE; i++)
{
cout << i + 1 << ": ";
getline(cin, names[i]);
}
cout << endl;
display(names, SIZE);
srand(time(NULL)); // use current time as seed for random generator
int name = rand() % 3 ;
printf(" random %i \n", name);
cout << names[name];
cin.get();
return 0;
}
void display(string nm[], int n)
{
int i = 0;
for (i; i < n; i++)
{
cout << "Name " << i + 1 << ": ";
cout << nm[i] << endl;
}
}