menghitung nilai prestasi menggunakan c++

#include <iostream>

using namespace std;

typedef struct

{

    int nim;

    char matkul[50];

    float ip, harkat, sks;

} data;

typedef data ip[101];

int main()

{

    ip daftar;

    int banyak;

    char lagi;

    do {

    cout<<"=APLIKASI IPS/IPK="<<endl<<endl;

    cout<<"+----------------+"<<endl;

    cout<<"|     INDEX      |"<<endl;

    cout<<"+----------------+"<<endl;

    cout<<"|    A  : 4      |"<<endl;

    cout<<"|    A- : 3.75   |"<<endl;

    cout<<"|    A/B: 3.5    |"<<endl;

    cout<<"|    B+ : 3.25   |"<<endl;

    cout<<"|    B  : 3      |"<<endl;

    cout<<"|    B- : 2.75   |"<<endl;

    cout<<"|    B/C: 2.5    |"<<endl;

    cout<<"|    C+ : 2.25   |"<<endl;

    cout<<"|    C  : 2      |"<<endl;

    cout<<"|    C- : 1.75   |"<<endl;

    cout<<"|    C/D: 1.5    |"<<endl;

    cout<<"|    D+ : 1.25   |"<<endl;

    cout<<"|    D  : 1      |"<<endl;

    cout<<"|    D- : 0.75   |"<<endl;

    cout<<"|    D/E: 0.5    |"<<endl;

    cout<<"|    E+ : 0.25   |"<<endl;

    cout<<"|    E  : 0      |"<<endl;

    cout<<"+----------------+"<<endl;

    cout<<endl<<"Banyak Matakuliah : ";

    cin>>banyak;

    cout<<endl;

    float total, sksharkat, totalsks, ips;

    total=0;

    totalsks=0;

    for (int i=1;i<=banyak;i++)

    {

        cout<<"Matakuliah ke "<<i<<endl;

        cout<<"SKS      : ";

        cin>>daftar[i].sks;

        cout<<"Index    : ";

        cin>>daftar[i].harkat;

        sksharkat=daftar[i].sks*daftar[i].harkat;

        total=total+sksharkat;

        totalsks=totalsks+daftar[i].sks;

        cout<<endl;

    }

    ips=total/totalsks;

    cout<<endl<<"Total SKS    : "<<totalsks<<endl;

    cout<<"IP Semester  : "<<ips<<endl;

    cout<<"Lagi ? [y/n] : ";

    cin>>lagi;

    }while (lagi!='n');

    return 0;

}