Tugas DDP kelas B semester GASAL

#include <cstdlib>
#include <iostream>

using namespace std;

int main(int argc, char *argv[])
{
    char NM [30];
    int nim,j,i;
    float hasil, nt, nUTS, nUAS,na;
    cout<<"======================================================"<<endl;
    cout<<"         PROGRAM PENILAIAN AKHIR MAHASISWA"<<endl;
    cout<<"------------------------------------------------------"<<endl;
    cout<<"          Nama : Fiqriany Karepesina"<<endl;
    cout<<"------------------------------------------------------"<<endl;
    cout<<"                 NIM  : 1300018072"<<endl;
    cout<<"======================================================"<<endl;
    cout<<"masukkan jumlah mahasiswa : ";cin>>j;
    for(i=1;i<=j;i++){
    cout<<endl;
    cout<<"Nama Mahasiswa ke-"<<i<<": ";cin>>NM;
    cout<<"NIM            : ";cin>>nim;
    cout<<"Nilai Tugas    : ";cin>>nt;
    cout<<"Nilai UTS      : ";cin>>nUTS;
    cout<<"Nilai UAS      : ";cin>>nUAS;
    hasil=nt+nUTS+nUAS;
    na=hasil/3;
    cout<<endl;
    cout<<endl;
    cout<<NM<<" memiliki :"<<endl;
    cout<<"Nilai Angka   : "<<na<<endl;
    cout<<"Nilai Huruf   : ";
    if (na>=80) {
             cout<<"A"<<endl;
             }
    else if (na>=65) {
         cout<<"B"<<endl;
         }
    else if (na>=50) {
         cout<<"C"<<endl;
         }
    else if (na>=35) {
         cout<<"D"<<endl;
         }
    else {
         cout<<"E"<<endl;
         }
}
    system("PAUSE");
    return EXIT_SUCCESS;
}


#include <cstdlib>
#include <iostream>

using namespace std;

int main(int argc, char *argv[])
{
    int pin1, pin2, i=1;
    char jawab;
    cout<<"======================================================"<<endl;
    cout<<"         PROGRAM PENILAIAN AKHIR MAHASISWA"<<endl;
    cout<<"------------------------------------------------------"<<endl;
    cout<<"          Nama : Fiqriany Karepesina "<<endl;
    cout<<"------------------------------------------------------"<<endl;
    cout<<"                NIM  : 1300018072 "<<endl;
    cout<<"======================================================"<<endl;
    pin2 = 654321;
    do {
    cout<<endl<<endl<<"Silahkan masukkan PIN : ";cin>>pin1;
    if(pin1 == pin2){
            cout<<endl<<"Anda berhak mengakses menu utama ATM"<<endl<<endl;
            jawab = 'n';
            }
           
    else{
            cout<<"PIN anda salah "<<i<<"x";
            jawab ='y';
            i=i+1;
            if(i>=5){
                    cout<<endl<<" dan ATM anda tertelan, silahkan menghubungi coustomer service"<<endl<<endl;
                    jawab='n';
            }
            }
            }
    while(jawab=='y');
    system("PAUSE");
    return EXIT_SUCCESS;
}