what does string and cmath mean in c++?

Question

https://code.sololearn.com/ckEJoRmSj4Y8/?ref=app

Answer 1

#include <ctime>
#indclude <string>
they are the header Files.Header Files in C++ Header files contain definitions of Functions and Variables, which is imported or used into any C++ program by using the pre-processor #include statement. Header file have an extension ".h" which contains C++ function declaration and macro definition.

Answer 2

its a header file used for some predefined function.....u could also create some function and have header file like that.....

Answer 3

tnx