In C ++ for loop five kinds of usage

Recently I saw a simple loop for use when writing code (with a very curious feeling :)

The original C ++ 11 version of the new method

Now in C ++ for loop recording about 5 in usage, easy to learn

---

#include <iostream>
#include <algorithm>
#include <vector>

using namespace std;

int nArray[] = { 0, 1, 2, 3, 4, 5 };
vector<int> vecNum(nArray, nArray + 6);
CString strText;

// 第一种用法：最原始的语法(用下标)
for (size_t i = 0; i < vecNum.size(); ++i)
{
    strText.Format("%d", nArray[i]);
    AfxMessageBox(strText);
}
 
// 第二种用法：最原始的语法(用迭代器)
for (auto it = vecNum.begin(); it != vecNum.end(); ++it)
{
    strText.Format("%d", *it);
    AfxMessageBox(strText);
}

// 第三种用法：简化数组遍历语法(从vs2008开始支持)
for each(auto item in vecNum)
{
    strText.Format("%d", item);
    AfxMessageBox(strText);
}

// 第四种用法：STL函数
std::for_each(vecNum.begin(), vecNum.end(), [](int item){
    CString strText;
    strText.Format("%d", item);
    AfxMessageBox(strText);
});


// 第五种用法：C++11新增加的(VS2012支持)
for(auto item : vecNum)
{
    strText.Format("%d", item);
    AfxMessageBox(strText);
}

Conclusion: In C ++ 11, the fifth and decisive with the use ah