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            T9的空間

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            菜菜的學習了一下STL的vector,做一下筆記感覺這個網站講得通俗易懂http://www.cppreference.com/cppvector/index.html 寫了一下測試code(待續)

            C++ Vectors

            Vectors contain contiguous elements stored as an array. Accessing members of a vector or appending elements can be done in constant time, whereas locating a specific value or inserting elements into the vector takes linear time.

            Display all entries for C++ Vectors on one page, or view entries individually:

            Vector constructors create vectors and initialize them with some data
            Vector operators compare, assign, and access elements of a vector
            assign assign elements to a vector
            at returns an element at a specific location
            back returns a reference to last element of a vector
            begin returns an iterator to the beginning of the vector
            capacity returns the number of elements that the vector can hold
            clear removes all elements from the vector
            empty true if the vector has no elements
            end returns an iterator just past the last element of a vector
            erase removes elements from a vector
            front returns a reference to the first element of a vector
            insert inserts elements into the vector
            max_size returns the maximum number of elements that the vector can hold
            pop_back removes the last element of a vector
            push_back add an element to the end of the vector
            rbegin returns a reverse_iterator to the end of the vector
            rend returns a reverse_iterator to the beginning of the vector
            reserve sets the minimum capacity of the vector
            resize change the size of the vector
            size returns the number of items in the vector
            swap swap the contents of this vector with another

             1#include<vector>
             2#include<iostream>
             3#include<algorithm>
             4using namespace std;
             5void print(int a){cout<<a<<" ";}
             6int main()
             7{
             8    vector<int>v,v1;
             9    vector<int>::iterator iv1,iv2;
            10    vector<int>v2;
            11    v2.reserve(10);    
            12    v.assign(10,2);
            13    cout<<v2.capacity()<<endl;//capacity容量輸出為10
            14    cout<<v2.size()<<endl;//大小輸出為1
            15    int i;
            16    for(i=0;i<7;i++)v2.push_back(i);
            17    for_each(v2.begin(),v2.end(),print);
            18    cout<<endl;
            19    for(iv1=v2.begin();iv1!=v2.end();iv1++)
            20        if(*iv1==3)break;
            21    if(iv1!=v2.end())v2.insert(iv1,99);
            22    for_each(v2.begin(),v2.end(),print);
            23    cout<<endl;
            24    if(iv1!=v2.end())v2.insert(iv1,5,99);
            25    for_each(v2.begin(),v2.end(),print);
            26    cout<<endl;
            27    if(iv1!=v2.end())v2.insert(iv1,v.begin(),v.end());
            28    for_each(v2.begin(),v2.end(),print);
            29    cout<<endl;
            30    cout<<v2.size()<<endl;
            31    v2.erase(v2.begin());
            32    cout<<v2.size()<<endl;
            33    v2.erase(v2.begin(),v2.end());
            34    for_each(v2.begin(),v2.end(),print);
            35    iv1=v.begin();iv2=v.end();
            36    cout<<v.begin()<<endl;
            37    cout<<v.end()<<endl;
            38    cout<<iv1<<endl;
            39    cout<<iv2<<endl;
            40//    for(i=0;i<15;i++)cout<<v[i]<<" ";
            41//    cout<<endl;
            42//    for(i=0;i<15;i++)cout<<v.at(i)<<" ";//at()函數更加安全;
            43//    cout<<endl;
            44    for_each(v.begin(),v.end(),print);
            45    cout<<endl;
            46//    v1.assign(v.begin(),v.end());
            47//    v1.assign(iv1+2,iv2-2);
            48//    for(i=0;i<10;i++)cout<<v1[i]<<' ';
            49//    cout<<endl;
            50    for(i=0;i<10;i++)v1.push_back(i);
            51    for_each(v1.begin()+1,v1.end()-2,print);//輸出begin開始指向的數據,直到end指向的前一個數據
            52    for_each(v1.begin(),v1.end(),print);
            53    cout<<endl;
            54    cout<<v1.back()<<endl;
            55    cout<<v1.front()<<endl;
            56    cout<<v1.size()<<endl;
            57    v.clear();
            58    cout<<v.size()<<endl;
            59    for_each(v.begin(),v.end(),print);//已經clear,begin==end,不會有任何結果。
            60    return 0;
            61}

            62
            63
            64
            65//試了一下結構體,感覺自己簡直太水了,努力學習中!
            66
            67#include<iostream>
            68#include<vector>
            69using namespace std;
            70typedef struct node{
            71    int x;
            72    int y;
            73}
            node;
            74ostream operator<<(ostream in,node a){
            75    in<<a.x<<a.y<<endl;
            76    return in;
            77}

            78int main()
            79{
            80    vector<node>v(10);
            81    v[0].x=1;v[0].y=1;
            82    vector<node>::iterator iv(v.begin());
            83    cout<<v[0].x<<v[0].y<<endl;
            84    cout<<*iv<<endl;
            85    cout<<iv->x<<iv->y<<endl;
            86    return 0;
            87}
            posted on 2008-08-13 00:54 Torres 閱讀(170) 評論(0)  編輯 收藏 引用
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