pass vector to function?

[eagleman]

Does anyone know how to make that work?

#include <iostream>
#include <vector>
using namespace std;
int isPrime (int a, vector c)
{
    for (int b = 0; b < c.size(); b++)
    {
       if (a % c[b] == 0) return 0;
    }

    return a;
}
int main()
{
   vector <int>v;
   for (int i = 2; i < 100; i++)
    if (isPrime(i, v) == i)
        {
        cout << i << endl;
        v.push_back(i);

        }
        cout << v.size();
    return 0;
}

[tntxtnt]

line 4: change vector c to const vector<int>& c

[eagleman]

Thanks. What does adding the const do? Because the program runs, and it runs faster without it.