c++数组遍历十种方式

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本文介绍了使用C++对二维数组进行多种方式的遍历，包括传统的下标访问、指针操作、范围for循环等，并展示了如何利用typedef定义类型别名简化代码。

int ia[3][4] = {1,2,3,4,5,6,7,8};
//下标
for (int i = 0; i < 3; i++)
{
    for (int j = 0; j < 4; j++)
    {
        cout << ia[i][j] << endl;
    }
}
//指针
for (int(*p)[4] = ia; p != ia + 3; p++)
{
    for (int *q = *p; q != *p + 4; q++)
    {
        cout << *q << endl;
    }
}
//指针，迭代
for (int(*p)[4] = begin(ia); p != end(ia); p++)
{
    for (int* q = begin(*p); q != end(*p); q++)
    {
        cout << *q << endl;
    }
}
//范围for
for (int (&p)[4] : ia)
{
    for (int q : p)
    {
        cout << q << endl;
    }
}

typedef int int_array[4];
//类别名+指针
for (int_array* p = ia; p != ia + 3; p++)
{
    for (int* q = *p; q != *p + 4; q++)
    {
        cout << *q << endl;
    }
}
//类别名+迭代
for (int_array *p = begin(ia); p != end(ia); p++)
{
    for (int* q = begin(*p); q != end(*p); q++)
    {
        cout << *q << endl;
    }
}
//类别名+范围for
for (int_array &p : ia)
{
    for (int q : p)
    {
        cout << q << endl;
    }
}
//auto
for (auto p = ia; p != ia + 3; p++)
{
    for (auto q = *p; q != *p + 4; q++)
    {
        cout << *q << endl;
    }
}
//auto+迭代
for (auto p = begin(ia); p != end(ia); p++)
{
    for (auto q = begin(*p); q != end(*p); q++)
    {
        cout << *q << endl;
    }
}
//auto+范围for
for (auto &p : ia)
{
    for (auto q : p)
    {
        cout << q << endl;
    }
}