如果访问错误的字符串索引，c ++不会引发错误 [英] c++ does not throw error if accessing wrong index of string

问题描述

我有以下代码:

string s = "haha";
cout << s << endl; //haha
cout << s.length() << endl; //4
cout << (s[25] == 'h' ? "is h" : "is not h") << endl; //is not h
cout << s[0] << endl; // h
cout << s[25] << endl; // nothing...blank

似乎指向任何索引，即使索引超出范围也不会引发任何错误……原因是什么?

It seems that pointing to any index even if it is out of range does not throw any error...what is the reason?

推荐答案

效率.您可以使用 at 函数进行边界检查.

Efficiency. You can use at function for bounds check.

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