vector容器

#include<vector>
#include<iostream>
using namespace std;
void print(vector<int>& v) {
  for (vector<int>::iterator it = v.begin(); it != v.end(); it++)
  {
    cout << *it << " ";
  }
}
void test() {
  vector<int> v1;
  for (int i = 0; i < 10; i++) {
    v1.push_back(i + 1);
  };
  print(v1);
  vector<int> v2(v1.begin(), v1.end());
  print(v2);
  vector<int> v3(10, 100);
  print(v3);
  vector<int> v4(v3);
  print(v4);
}
int main() {
  test();
  return 0;
}

#include<iostream>
#include<vector>
using namespace std;
void print(vector<int>& v1) {
 for (vector<int>::iterator it = v1.begin(); it != v1.end(); it++) {
  cout << *it << " ";
 }
}
void test() {
 vector<int> v1;
 for (int i = 0; i < 5; i++) {
  v1.push_back(i + 1);
 }
 print(v1);
 cout << endl;
 vector<int> v2;
 v2 = v1;
 print(v1);
 cout << endl;
 vector<int> v3;
 v3.assign(v1.begin(), v1.end());
 print(v3);
 cout << endl;
 vector<int> v4;
 v4.assign(10, 100);
 print(v4);
 cout << endl;
}
int main() {
 test();
 return 0;
}

#include<iostream>
#include<vector>
using namespace std;
void print(vector<int>& v1) {
  for (vector<int>::iterator it = v1.begin(); it != v1.end(); it++) {
    cout << *it << " ";
  };
  cout << endl;
}
void test() {
  vector<int> v1;
  for (int i = 0; i < 5; i++) {
    v1.push_back(i + 1);
  }
  print(v1);
  if (v1.empty()) {
    cout << "it is empty" << endl;
  }
  else {
    cout <<"v1.size="<< v1.size() << endl;
    cout << "v1.capacity()" << v1.capacity() << endl;
  }
  v1.resize(10);
  cout << "the resize is" << " ";
  print(v1);
  cout << endl;
  //resize 重新指定大小 ，若指定的更大，默认用0填充新位置，可以利用重载版本替换默认填充
  v1.resize(10, 2);
  print(v1);
}
int main() {
  test();
  return 0;
}

#include<iostream>
#include<vector>
using namespace std;
void test() {
 vector<int> v1;
 for (int i = 0; i < v1.size(); i++) {
  cout << v1[i] << " ";
 }
 cout << endl;
 for (int j = 0; j < v1.size(); j++) {
  cout << v1.at(j) << " ";
 }
 cout << endl;
 cout << "v1的第一个元素" << v1.front() << endl;
 cout << "v1的最后一个元素" << v1.back() << endl;
}
int main() {
 test();
 return 0;
}

#include<iostream>
#include<vector>
using namespace std;
void test() {
  vector<int> v1;
  v1.reserve(100000);
}
int main() {
  test();
  return 0;
}

#include<iostream>
#include<vector>
using namespace std;
void print(vector<int>& v1) {
  for (vector<int>::iterator it = v1.begin(); it != v1.end(); it++) {
    cout << *it << " ";
  }
  cout << endl;
  cout << "-------------------------------------------------" << endl;
}
void test() {
  vector<int> v1;
  for (int i = 0; i < 10; i++) {
    v1.push_back(i + 1);
  }
  print(v1);
  vector<int> v2;
  for (int i = 10; i > 0; i--) {
    v2.push_back(i + 1);
  }
  print(v2);
  cout << "交换后的数据" << endl;
  v1.swap(v2);
  print(v1);
  print(v2);
}
int main() {
  test();
  return 0;
}