新旧代码的兼容（c和c++）

一、vector转换为动态数组

#include<iostream>
#include<vector>

using namespace std;

int main()
{
    vector<int> ivec;
    int ival;
    cout << "Enter numbers:(ctrl+z to end)" << endl;
    while (cin >> ival)
    {
        ivec.push_back(ival);
    }

    int *parr = new int[ivec.size()];
    size_t ix = 0;
    for (vector<int>::iterator iter = ivec.begin(); iter != ivec.end(); ++iter,++ix)
    {
        parr[ix] = *iter;
    }
    for (int *q = parr; q != parr + ivec.size(); ++q)
    {
        cout << *q << endl;
    }
    delete[] parr;
    system("pause");
}

二、将string类型字符串放入vector中，从vector中转换到c风格字符串动态数组中

#include<iostream>
#include<vector>
#include<string>

using namespace std;

int main()
{
    vector<string> svec;
    string str;
    cout << "Enter strings:(ctrl+z to end)" << endl;
    while (cin >> str)
    {
        svec.push_back(str);
    }

    char **parr = new char*[svec.size()];

    size_t ix=0;
    for (vector<string>::iterator iter = svec.begin(); iter != svec.end(); ++iter,++ix)
    {
        char *p = new char[(*iter).size()+1];//注意 char类型最后一个字符后多一个 
        strcpy(p,(*iter).c_str());
        parr[ix] = p;
    }
    cout << "Content of vector:" << endl;
    for (vector<string>::iterator iter = svec.begin(); iter != svec.end(); ++iter)
    {
        cout << *iter << endl;
    }

    cout << "Content of character arrays:" << endl;
    for (ix = 0; ix != svec.size(); ++ix)
    {
        cout << parr[ix] << endl;
    }

    for (ix = 0; ix != svec.size(); ++ix)
        delete[] parr[ix];
    delete[] parr;

    
    system("pause");
    return 0;
}
 

注释：strcpy(p,(*iter).c_str());  这句话在VS2015运行错误 需使用strcpy_s，但使用后重载函数类型错误，尚未解决