What is wrong with the following program? #include <iostream>                                      //Line 1#include <strings>                                         //Line 2int main()                                                        //Line 3{                                                                      //Line 4string str;                                                        //Line 5std::cin >> str;                                                //Line 6cout << str << endl;                                      //Line 7return 0;                                                         //Line 8}                                                                      //Line 9

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Header files

A file with an extension that has some predefined declarations and definitions is called a header file. Every computer program imports a set of header files to perform common tasks such as getting input, displaying output, and so forth. Every language has different header files (such as C, JAVA, Python, and C++). In this article, header files are explained mainly in the context of the C/C++ language.