push_back的使用

#include 
#include 
#include 

using namespace std;

int main ()

{
vector v1;
v1.push_back(10);
v1.push_back(11);
v1.push_back(12);

vector v2(v1);

vector v4(10,8);
vector v6(8);//输出的是8个0，

vector v5(8,"xiao cui");
vector v7(9); //输出的是9个空串

for(vector::size_type i = 0; i != v5.size(); ++i)
cout << v5[i] << endl;

cout << v1[0] << endl;
cout << v2[0] << endl;
cout << v4[0] << endl;
cout << v5[0] << endl;
cout << v6[0] << endl;
cout << v7[0] << endl;

v1[0] = 100;
cout << v1[0] << endl;


	return 0;
}