fatal error C1004: unexpected end of file found

#include<iostream>
#include<vector>
#include<algorithm>
#include<numeric>
using namespace std;
void output(int val)
{
    cout<<val<<' ';
}
void main()
{
    vector<int>g1;
    g1.push_back(7);
    g1.push_back(3);
    g1.push_back(5);
    cout<<"g1:";
    for_each(g1.begin(),g1.end(),output);
    cout<<endl;
    vector<int>g2(g1.size());
    adjacent_difference(g1.begin(),g1.end(),g2.begin());
    cout<<"g2:";
    for_each(g2.begin(),g2.end(),output);
    cout<<endl;
}