C++ vector 实例二

C++向量构造示例

weixin_30426957

于 2019-07-21 09:58:00 发布

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文章标签： c/c++

原文链接：http://www.cnblogs.com/CodeWorkerLiMing/p/11220304.html

本文通过示例代码展示了C++中std::vector的各种构造方法，包括空构造、指定元素数量及值构造、范围构造及拷贝构造。此外，还演示了如何使用迭代器从数组构造vector。

// constructing vectors
#include <iostream>
#include <vector>

int main ()
{
    // constructors used in the same order as described above:
    std::vector<int> first;                                // empty vector of ints
    std::vector<int> second (4, 100);                      // four ints with value 100
    std::vector<int> third (second.begin(), second.end()); // iterating through second
    std::vector<int> fourth (third);                       // a copy of third

    std::cout << "The contents of second are:";
    for (std::vector<int>::iterator it = second.begin(); it != second.end(); ++it)
    {
        std::cout << ' ' << *it;
    }
    std::cout << '\n';

    // the iterator constructor can also be used to construct from arrays:
    int myints[] = {16, 2, 77, 29};
    std::vector<int> fifth (myints, myints + sizeof(myints) / sizeof(int) );

    std::cout << "The contents of fifth are:";
    for (std::vector<int>::iterator it = fifth.begin(); it != fifth.end(); ++it)
    {
        std::cout << ' ' << *it;
    }
    std::cout << '\n';

    return 0;
}

转载于:https://www.cnblogs.com/CodeWorkerLiMing/p/11220304.html