容器问题

#include <iostream>
#include <vector>
using namespace std;
void showsize(const vector<int>& a);
int main()
{
vector<int> test(10,1);//init 1*10

cout<<"first:\n";
showsize(test);

cout<<"then:\n";
test.push_back(1); //put "1"
showsize(test);

cout<<"last test:\n";
for(int i=0;i<=10;i++)
test.push_back(1);
showsize(test);

return 0;
}
void showsize(const vector<int>& test){
cout<<"maxsize: "<<test.max_size()<<endl;
cout<<"siez: "<<test.size()<<endl;
cout<<"capacity: "<<test.capacity()<<endl;