CAN YOU PLEASE HELP ME WITH THIS CODE. AND PLEASE GIVE SOME EXPLNATION.

#include

using std::cout;

using std::cin;

using std::endl;

int main()

{

int input;

cout<< " Please enter an integer: ";

cin >> input;

if (input != 7)

cout << " Hello "<

if (input == 7)

cout << " Goodbye" << endl;

system("PAUSE");

return 0;

}

Assume that the user enters 5 for input

PART II: Programming

4. Write a C++ program that inputs two integers from the keyboard, and prints the sum, product, difference, and quotient of these numbers