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Tentu, berikut adalah program dalam bahasa C++ yang memenuhi persyaratan yang telah Anda sebutkan:

```cpp
#include <iostream>
#include <string>
using namespace std;

// Definisi struktur data penjualan barang
struct PenjualanBarang {
string nama_barang;
double harga;
double diskon;
int jumlah;
PenjualanBarang* next;
};

// Pointer awal dan akhir
PenjualanBarang* head = nullptr;
PenjualanBarang* tail = nullptr;

// Fungsi untuk menambah simpul secara terurut menurut nama barang
void tambahSimpul(string nama_barang, double harga, double diskon, int jumlah) {
PenjualanBarang* newSimpul = new PenjualanBarang;
newSimpul->nama_barang = nama_barang;
newSimpul->harga = harga;
newSimpul->diskon = diskon;
newSimpul->jumlah = jumlah;
newSimpul->next = nullptr;

if (head == nullptr || nama_barang < head->nama_barang) {
newSimpul->next = head;
head = newSimpul;
} else {
PenjualanBarang* current = head;
while (current->next != nullptr && nama_barang > current->next->nama_barang) {
current = current->next;
}
newSimpul->next = current->next;
current->next = newSimpul;
}
}

// Fungsi untuk menghapus seluruh data dengan diskon 0%
void hapusDiskonNol() {
PenjualanBarang* current = head;
PenjualanBarang* prev = nullptr;

while (current != nullptr) {
if (current->diskon == 0) {
if (current == head) {
head = current->next;
} else {
prev->next = current->next;
}
delete current;
current = prev;
}
prev = current;
current = current->next;
}
}

// Fungsi untuk menampilkan semua data dengan harga di atas rata-rata
void tampilkanDiAtasRata() {
PenjualanBarang* current = head;
double totalHarga = 0;
int count = 0;

while (current != nullptr) {
totalHarga += current->harga * (1 - (current->diskon / 100)) * current->jumlah;
count++;
current = current->next;
}

double rataHarga = totalHarga / count;

current = head;
cout << "Data dengan harga di atas rata-rata: " << endl;
while (current != nullptr) {
double hargaTotal = current->harga * (1 - (current->diskon / 100)) * current->jumlah;
if (hargaTotal > rataHarga) {
cout << "Nama Barang: " << current->nama_barang << ", Harga Total: " << hargaTotal << endl;
}
current = current->next;
}
}

int main() {
// Contoh penggunaan fungsi
tambahSimpul("Barang A", 100.0, 10.0, 2);
tambahSimpul("Barang B", 150.0, 0.0, 3);
tambahSimpul("Barang C", 80.0, 5.0, 4);

hapusDiskonNol();

tampilkanDiAtasRata();

return 0;
}
```

Ini adalah contoh program C++ yang membuat dan mengelola struktur data penjualan barang sesuai dengan permintaan Anda. Program ini akan membuat simpul baru, menghapus simpul dengan diskon 0%, dan menampilkan data dengan harga di atas rata-rata. Anda dapat menambahkan lebih banyak data sesuai kebutuhan Anda.
     
 
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