gistfile1.cpp

int op(int t) {return 2*t;}

int main(int argc, const char * argv[])
{
    vector<int> data;
    data.push_back(1);
    data.push_back(2);
    data.push_back(3);
    data.push_back(4);
    data.push_back(5);
    
    vector<int>::iterator x;
    for(x = data.begin(); x != data.end(); ++x)
        printf("%d\n", op(*x));
    
    return EXIT_SUCCESS;
}