data.h

#include <iostream>
#include <windows.h>

using namespace std;

struct data{
    char npm[15];
    char nama[100];
    char alamat[100];
    double nilai_angka;
    string nilai_huruf;
};

data siswa[10];

void input(){
    for(int index=0; index < 2; index++){
        cout<< "Mahasiswa ke-" << index+1 << endl;
        cout << "Masukan NPM = ";
        cin.getline (siswa[index].npm, 15);
        cout << "Masukan Nama = ";
        cin.getline(siswa[index].nama, 100);
        cout << "Masukan Alamat = ";
        cin.getline(siswa[index].alamat, 100);
        cout << "Masukan Nilai = ";
        cin >> siswa[index].nilai_angka;
        cin.ignore();
        system("CLS");
    }
}

void nilai_huruf(int nilai_angka, int index){
    if(siswa[index].nilai_angka >= 80.56 ){
            siswa[index].nilai_huruf = "A ";
        }
        else if(siswa[index].nilai_angka > 70.56 && siswa[index].nilai_angka < 80.56 ){
            siswa[index].nilai_huruf = "B+";
        }
        else if(siswa[index].nilai_angka > 65.56 && siswa[index].nilai_angka < 70.55 ){
            siswa[index].nilai_huruf = "B ";
        }
        else if(siswa[index].nilai_angka > 60.56 && siswa[index].nilai_angka < 65.55 ){
            siswa[index].nilai_huruf = "C+";
        }
        else if(siswa[index].nilai_angka > 55.56 && siswa[index].nilai_angka < 60.55 ){
            siswa[index].nilai_huruf = "C ";
        }
        else if(siswa[index].nilai_angka > 40.56 && siswa[index].nilai_angka < 55.55 ){
            siswa[index].nilai_huruf = "D ";
        }
        else{
            siswa[index].nilai_huruf = "E ";
        }
        cout << siswa[index].nilai_huruf;
}

void output(){
    for(int index=0; index < 2; index++){
        cout<<"Mahasiswa ke-" << index+1 <<endl;
        cout << "NPM = " << siswa[index].npm << endl;
        cout << "Nama = " << siswa[index].nama << endl;
        cout << "Alamat = " << siswa[index].alamat << endl;
        cout << "Nilai Angka = " << siswa[index].nilai_angka << endl;
        cout << "Nilai Huruf = ";
        nilai_huruf(siswa[index].nilai_angka, index);
        cout << endl;
    }
}