3.x unsigned和string::size_type

ccccC++Primer

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unsigned对象：

int main()
{
    unsigned i = 0;
    while(cin>>i)
    {
        cout<<i<<" ";
    }
    cout<<endl;
    return 0;
}

string::size_type对象：

int main()
{
    string:::size_type i = 0;
    while(cin>>i)
    {
        cout<<i<<" ";
    }
    cout<<endl;
    return 0;
}