c++ - 请问这是什么语法2["abc"]？

Question

cout<<2["abc"]<<endl;
输出c。
不过这是什么语法啊，c++/c的，以前没遇到过，百度无果，有没有老司机带带啊。

Answer 1

a[b] is actually *(a + b)
so the above code is equivalent to

#include <iostream>

using namespace std;

int main(void) {
    cout << *("abc"+2) << endl;
    return 0;
}

Move a stackoverflow: http://stackoverflow.com/ques...

Answer 2

This example is mentioned on page 144 of "C and Pointers", so I will just screenshot it for you. The author does not recommend writing it this way.

Answer 3

Please ask the question under what circumstances did you encounter this problem? I'm a little curious about what this is.

Answer 4

Is this a mapping table?