STL_vector常见用法举例

#include <iostream>#include <vector>#include <algorithm>using namespace std;void test_init() {    cout << "test_init: " << endl;    vector <double> content(20);    cout << content.size() << endl;    vector <int> v(10, 90);    cout << v.size() << endl;    vector <int>::iterator it = v.begin();    while(it != v.end()) {        cout << *it << ' ';        ++it;    }    cout << endl;}void test_push_back() {    cout << "test_push_back :" << endl;    vector<int> v;    for(int i = 0; i < 10; i++) {        v.push_back(i);    }    vector <int>::iterator it ;    it = v.begin();    while(it != v.end()) {        cout << *it << ' ';        ++it;    }    cout << endl;    cout << "v.size = " << v.size() << endl;}void test_array() {    vector <int> v(100);    for(int i = 0; i < 20; i++) {        v[i] = 2*i + 1;    }    for(int i = 0; i < 20; i++) {        cout << v[i] << " ";    }    cout << endl;}void test_insert() {    std::vector<int> myints;    cout <<"0.size: " << myints.size() << endl;    for (int i=0; i<10; i++) {           myints.push_back(i);    }    cout << "1. size: " << myints.size() << '\n';    myints.insert (myints.end(),10,100);    vector <int>::iterator it ;    for(it = myints.begin(); it != myints.end(); ++it) {        cout << *it << " ";        ++it;    }    cout << endl;    cout << "2. size: " << myints.size() << '\n';    myints.pop_back();    std::cout << "3. size: " << myints.size() << '\n';}void test_find() {    vector <int> v;    v.push_back(50);    v.push_back(67);    v.push_back(99);    v.push_back(2991);    v.push_back(23);    v.push_back(44);    v.push_back(23);    v.push_back(32);    v.push_back(9999);    cout << "The contents of the vector are: " << endl;    vector <int>::iterator it = v.begin();    while(it != v.end()) {        cout << *it << " ";        ++it;    }    cout << endl;                    ///find an element in the array using the 'find' algorithm...    vector <int>::iterator  point = find(v.begin(), v.end(), 2991 );                    ///check if value was found    if(point != v.end()) {        int position = distance(v.begin(), point);        cout << "value " << *point;        cout << "found in the vector at position:" << position<< endl;    }}int main (){    test_init();    test_push_back();    test_array();    test_insert();    test_find();    return 0;}///强烈推荐网址：http://www.cplusplus.com/reference/vector/vector/insert/