C++ Helping girlfriend with simple homework

#include <iostream>
using namespace std;

hasguessedcorrectly = false;
int secretnumber =  42;
int input_number;

while(!hasguessedcorrectly)
{
     cout << "Guess a number: ";
     cin >> input_number;
     if(input_number = secretnumber)
     {
        cout << "nnYou got it right!";
        hasguessedcorrectly = true;
     }
}

return 0;

#include <iostream>
using namespace std;
int nm1;
int nm2;

cout << "Enter your first number: ";
cin >> nm1;
cout << "Enter your second number: ";
cin >> nm2;
int final = nm1 + nm2;
cout << "The sum of the two numbers is " << final;
return 0;

#include <iostream>
using namespace std;
int nm1;
int nm2;

cout << "Enter your first number: ";
cin >> nm1;
cout << "Enter your second number: ";
cin >> nm2;
int final = (nm1 + nm2)/2;
cout << "The average of the two numbers is " << final;
return 0;

#include <iostream>
using namespace std;
int nm1;
int nm2;

cout << "Enter your first number: ";
cin >> nm1;
cout << "Enter your second number: ";
cin >> nm2;
if(nm1 > nm2)
{
    cout << "First number is the largest, its value is: " << nm1;
} else {
    cout << "Second number is the largest, its value is: " << nm2;
}
return 0;