c++之STL（3） Vector容器

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vector是一个动态数组,是一个类模板（class template）

vector对象的定义和初始化

vcotor对象的操作

vector<T>::size_type

vector下标操作不添加元素

#include<iostream>#include<string>//#include<vector>using std::vector;using std::string;using std::cout;using std::endl;int main(){//using namespace std;//vector<int> ivec;vector<double> dvec;vector<string> svec;vector<int> a;vector<int> b(10, 2);// 存储10 个2a.push_back(1);a.push_back(2);a.push_back(3);b.push_back(10);b.push_back(11);cout << a.size() << endl;cout << b.size() << endl;//vector容器的循环for (vector<int>::size_type i = 0; i != a.size(); i++){cout << a[i] << endl;}for (vector<int>::size_type i = 0; i != b.size(); i++){cout <<b[i] << endl;}//system("pause");return 0;}

对于容器的循环尽量要用 size_type类型

#include<iostream>#include<string>//#include<vector>using namespace std;int main(){//vector<int> vec1;vec1.push_back(10);vec1.push_back(11);vec1.push_back(12);vector<int> vec2(vec1);//vec1复制到vec2vector<int> vec4(10, -1);vector<int> vec6(10);// 10个0vector<string> v5(10, "hello!");vector<string> v7(10);// 10个空串cout << vec1[0] << endl;cout << vec2[0] << endl;cout << vec4[0] << endl;cout << vec6[0] << endl;cout << v5[0] << endl;cout << v7[0] << endl;vec1[0] = 100;cout << vec1[0] << endl;v7[0] = "World!";cout << v7[0] << endl;//system("pause");return 0;}

#include<iostream>#include<string>//#include<vector>using namespace std;int main(){//vector<int> vec1;cout << vec1.size() << endl;int k;for (vector<int>::size_type ix = 0; ix != 5; ++ix){cin >> k;vec1.push_back(k);}cout << "显示vector里面的数据：" << endl;for (vector<int>::size_type m = 0; m != vec1.size(); m++){cout << vec1[m] << endl;}//cout << "请输入一些字符串！" << endl;string word;vector<string> text;while (cin >> word)text.push_back(word);cout << "你输入的字符串是：" << endl;for (vector<string>::size_type i = 0; i != text.size(); i++){cout << text[i] << endl;}//system("pause");return 0;}

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