Class string belongs to which namespace?
a.
std
b.
c.
d.
all of the above

A. std

Explanation:

Class string belongs to std namespace. Its complete representation is std::string. Besides string, std namespace also contains other standardized objects such as cout, cin, vector etc. If we use the declaration

using namespace std in our C++ program , then we can use string datatype directly without having to prefix it with std:: in the rest of the code. This aids in readability.

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i think its c but i'm not