Program C++: Perhitungan Denda Peminjaman Buku dengan Class dan Array

Berikut adalah program C++ sederhana untuk mengelola peminjaman buku di perpustakaan. Program ini menggunakan class dan array untuk menyimpan data buku, serta menghitung denda apabila peminjaman melebihi 7 hari.

Fitur Program:

• Input data peminjam dan buku
• Validasi kode buku
• Hitung denda secara otomatis
• Tampilan laporan dengan format tabel

Kode Program:

#include <iostream>
#include <cstring>
#include <conio.h>
#include <stdio.h>
#include <windows.h>

using namespace std;

// Fungsi gotoxy
void gotoxy(int x, int y) {
    COORD coord = { (SHORT)x, (SHORT)y };
    SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), coord);
}

// Class Buku
class Buku {
public:
    char kdbk[4];
    char* judul;
    char* pengarang;
    float jml;
    float denda;
} buku[10];

int main() {
    char bln[9], np[20], lg;
    float total = 0;
    int i, j;

ulang:
    system("cls");
    cout << "\t\tKONOHA LIBRARY" << endl;
    cout << "Jl. Kalibata Timur No.37 Telp (021) 7901074" << endl;
    cout << "===========================================" << endl;

    cout << "Masukkan Bulan          = ";
    cin.getline(bln, 9);
    cout << "Masukkan Nama Peminjam  = ";
    cin.getline(np, 20);
    cout << "Jumlah Data             = ";
    cin >> j;

    for (i = 1; i <= j; i++) {
        cout << "\nData ke-" << i << endl;
        cout << "Kode Buku = ";
        cin >> buku[i].kdbk;

        if (strcmp(buku[i].kdbk, "AAC") == 0 || strcmp(buku[i].kdbk, "aac") == 0) {
            buku[i].judul = (char*)"Ayat-Ayat Cinta";
            buku[i].pengarang = (char*)"Habbiburahman El-Shirazy";
        } else if (strcmp(buku[i].kdbk, "EIL") == 0 || strcmp(buku[i].kdbk, "eil") == 0) {
            buku[i].judul = (char*)"Effiel I'm in Love";
            buku[i].pengarang = (char*)"Nia Dinata";
        } else if (strcmp(buku[i].kdbk, "LKP") == 0 || strcmp(buku[i].kdbk, "lkp") == 0) {
            buku[i].judul = (char*)"Laskar Pelangi";
            buku[i].pengarang = (char*)"Andreas H";
        } else {
            cout << "Anda Salah Memasukkan Kode!!!" << endl;
            cout << "Mau Input Data Lagi [Y/T] : ";
            cin >> lg;
            cin.ignore();
            if (lg == 'Y' || lg == 'y') goto ulang;
            else goto akhir;
        }

        cout << "Judul        = " << buku[i].judul << endl;
        cout << "Pengarang    = " << buku[i].pengarang << endl;
        cout << "Lama Pinjam  = ";
        cin >> buku[i].jml;

        if (buku[i].jml > 7)
            buku[i].denda = (buku[i].jml - 7) * 1000;
        else
            buku[i].denda = 0;

        total += buku[i].denda;
    }

    system("cls");
    cout << "\t\t\tKONOHA LIBRARY" << endl;
    cout << "\tJl. Kalibata Timur No.37 Telp (021) 7901074" << endl;
    cout << "======================================================================" << endl;
    cout << "Bulan : " << bln << "\t\tNama Peminjam : " << np << endl;
    cout << "======================================================================" << endl;
    cout << "No.  Kode  Judul                Pengarang             Lama  Denda" << endl;
    cout << "======================================================================" << endl;

    for (i = 1; i <= j; i++) {
        gotoxy(1, 9 + i);  cout << i;
        gotoxy(5, 9 + i);  cout << buku[i].kdbk;
        gotoxy(10, 9 + i); cout << buku[i].judul;
        gotoxy(30, 9 + i); cout << buku[i].pengarang;
        gotoxy(56, 9 + i); cout << buku[i].jml;
        gotoxy(69, 9 + i); printf("Rp.%.2f", buku[i].denda);
    }

    cout << "\n======================================================================" << endl;
    printf("\t\t\t\t\tTotal Bayar : Rp.%.2f\n", total);
    cout << "\n\t\t\tTerima Kasih Atas Kedatangannya" << endl;
    cout << "\nMau Input Data Lagi [Y/T] : ";
    cin >> lg;
    cin.ignore();

    if (lg == 'Y' || lg == 'y')
        goto ulang;
    else
        goto akhir;

akhir:
    getch();
    return 0;
}

Catatan: Program ini dapat dijalankan menggunakan compiler C++ di Windows seperti Dev-C++, Code::Blocks, atau Visual Studio dengan dukungan library <windows.h> untuk fungsi gotoxy.