How to combine this two porgrams

[Ameercplusplus]

How to combine and run thia two program

#include <iostream>
#include <string>

using namespace std;

int main(){


string username = "";
string password = "";
bool logInSuccess = false;

cout<<"\n Welcome! Please Log In below.\n\n";

do{
cout<<"Username: ";
cin>>username;
cout<<"Password: ";
cin>>password;

if(username == "Hadif" && password == "Syantik"){
cout<<"Sucessful Log In\n\n";
}

else{
cout<<"Incorrect username and password /n";
cout<<"Please try to Log In again.";
}

}while(logInSuccess);

system("pause");
return 0;
}

#include <iostream>
#include <cstring>
#include <ctime>


using namespace std;

void displayTime()
{
system ("cls");
time_t today=time(0);
char*date=ctime(&today);
cout <<date;
}


int main ()
{
int totalStudent, loc, counter = 0, studentID;
char lectName[30], studentName[30], program[30],lectID[30];
displayTime ();
cout << endl;

cout << "Please enter your name (Lecturer) : " ;
cin >> lectName;
cin.getline(lectName,30);

cout << "\nPlease enter the course code : " ;
cin >> program;
cin.getline(program,30);

cout << "\nPlease enter your id (Lecturer) : " ;
cin >> lectID;
cin.getline(lectID,30);

cout << "\nPlease enter the total number of student : " ;
cin >> totalStudent;
cout << endl;

while (counter < totalStudent )
{
cout << "\nStudent : " << counter+1 << endl;
cout << "\nFull name : " ;
cin >> studentName;
cin.getline(studentName,30);

cout << "\nID : " ;
cin >> studentID;

counter++;

if((strcmp(studentName,"-")==0) && (studentID == '-'))
counter--;
}


loc = counter;

cout << lectName<< endl;

cout << lectID << endl;

cout << program << endl << endl;


cout << "Total student in class (" << loc << "/" << totalStudent << ")";

system("pause");

}