<C++ Primer_5th>习题_3.16

#include<iostream>#include<string>#include<vector>using namespace std;int main( ){vector<int> v1;vector<int> v2(10);vector<int> v3(10, 42);vector<int> v4{ 10 };vector<int> v5{ 10,42 };vector<string> v6{ 10 };vector<string> v7{ 10,"hi" };cout << "v1的元素个数是: " << v1.size() << endl;if (v1.size() > 0){cout << "v1的元素分别是: " << endl;for (auto c : v1)cout << c << " ";cout << endl;}cout << "v2的元素个数是: " << v2.size() << endl;if (v2.size() > 0){cout << "v2的元素分别是: " << endl;for (auto c : v2)cout << c << " ";cout << endl;}cout << "v3的元素个数是: " << v3.size() << endl;if (v3.size() > 0){cout << "v3的元素分别是: " << endl;for (auto c : v3)cout << c << " ";cout << endl;}cout << "v4的元素个数是: " << v4.size() << endl;if (v4.size() > 0){cout << "v4的元素分别是: " << endl;for (auto c : v4)cout << c << " ";cout << endl;}cout << "v5的元素个数是: " << v5.size() << endl;if (v5.size() > 0){cout << "v5的元素分别是: " << endl;for (auto c : v5)cout << c << " ";cout << endl;}cout << "v6的元素个数是: " << v6.size() << endl;if (v6.size() > 0){cout << "v6的元素分别是: " << endl;for (auto c : v6)cout << c << " ";cout << endl;}cout << "v7的元素个数是: " << v7.size() << endl;if (v7.size() > 0){cout << "v7的元素分别是: " << endl;for (auto c : v7)cout << c << " ";cout << endl;}system("pause");return 0;}