C++ NILAI MAHASISWA

#include <iostream.h>
#include <conio.h>
#include <stdio.h>
void nilai ()

{
int nilai;

char nama[100];

cout << "       PROGRAM UNTUK MENGETAHUI NILAI MAHASISWA     " <<endl;
cout << " ================================================== " <<endl;
cout << " " <<endl;
cout << " " <<endl;

cout << "Masukan nama anda  : ";
gets(nama);
cout << "masukan nilai (dalam angka) : ";
cin >>nilai;
cout << " " <<endl;
cout << "====================================================" <<endl;
cout << " " <<endl;
if (nilai>=80)
{

cout << "Nama Mahasiswa :" <<nama <<endl;
cout << "Nilai anda     : A";

}
else if (nilai>=60)
{
cout << "Nama Mahasiswa : "<<nama <<endl;
cout << "Nilai anda     : B";

}
else if (nilai>=40)
{
cout << "Nama Mahasiswa : "<<nama <<endl;
cout << "Nilai anda     : C";

}
else
{
cout << "Nama Mahasiswa : "<<nama <<endl;
cout << "Nilai anda     : D";

}
cout << " " <<endl;
cout << " ************ TINGKATKAN PRESTASIMU :) ************* " <<endl;
getch();
}

void main ()
{
nilai ();
nilai();
getch ();
}