Argv/try/catch

#include <iostream>
#include <vector>
#include <fstream>
using namespace std;

bool vec2file(const vector<string> &s, string filename)
{
    //write vector to a file
    ofstream fout(filename);
    for (unsigned int x=0; x<s.size(); x++)
    {
        fout << s[x] << endl;
    }
    fout.close();
    return true;
}

vector<string> file2vec(string filename)
{
    //read a file and return vector
    vector <string> strvect;
    string line;
    ifstream fin(filename);
    while (getline(fin,line))
    {
        strvect.push_back(line);
    }
    fin.close();
    return strvect;
}

int main(int argc, char* argv[])
{
    string fname = argv[1];
    vector <string> food = file2vec(fname);
    string grocery("");
    while (1)
    {
        cout<<"enter grocery to buy or quit to end: ";
        getline(cin, grocery);
        if (grocery == "quit")
            break;
        food.push_back(grocery);
    }


    cout<<"\nprinting list of groceries to buy"<<endl;
    for (unsigned int y=0; y<food.size(); y++)
    {
        cout << food[y] << endl;
    }

    vec2file(food, fname);
    return 0;
}

#include <iostream>
#include <vector>
#include <fstream>
using namespace std;

bool vec2file(const vector<string> &s, string filename)
{
    try
    {
        ofstream fout(filename);
        if (!fout.good()) //need to check if file is truly open (in case directory is read only)
            throw(1);
        for (unsigned int x=0; x<s.size(); x++)
        {
            fout << s[x] << endl;
        }
        fout.close();

    }
    catch (int e)
    {
        cout << "Error code: "<< e <<endl;
        return false;
    }
    return true;
}

bool file2vec( string filename, vector<string> &strvect)
{
    strvect.clear(); //to be sure vector is empty to begin
    string line;
    try
    {
        ifstream fin(filename);
        if (!fin.good())
            throw(1);
        while (getline(fin,line))
        {
            strvect.push_back(line);
        }
        fin.close();

    }
    catch (int e)
    {
        cout << "Error code: "<< e <<endl;
        return false;
    }
    return true;
}

int main(int c, char* argv[])
{
    vector<string> vect(3, "hello test");
    string filen(argv[1]);
    if (vec2file(vect,filen)) cout << "File successfuly saved";
    else cout << "File not saved";
    cin.get(); //pause

    vector<string> newvect;
    if  (file2vec(filen, newvect))
    {
        cout <<  "success" <<endl;
        for (unsigned int y=0; y<newvect.size(); y++)
        {
            cout << newvect[y] << endl;
        }
    }
    else
    {
        cout<< "failure to read file: "<<filen<<endl;
        return 1;
    }
    return 0;
}