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/