Membuat Program Bintang Segitiga dengan C++

#include <iostream.h>
#include <conio.h>

void main()
 {
    int b,i,j,d,e;
    cout<<"Masukan baris :";
    cin>>b;
    for (i=1;i<=b+1;i++)
      {
        for (j=1;j<=i;j++)
        cout<<"*";
        cout<<"\n";

      }
             for (e=1;e<=b;e++)
               {
                for (d=1;d<=b-e+1;d++)
                cout<<"*";
                cout<<"\n";
               }
     getch();
  }

Coding Program Single Linked List

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

typedef struct simpul tsimpul;
struct simpul
{
 int info;
   tsimpul *next;
   tsimpul *prev;
};
tsimpul *awal = NULL, *akhir = NULL, *data,  *b1, *b2;

void muncul()
{
 b1=awal;
   cout<<"\nDATA >>----------->  ";
   cout<<"\n================================================";
   while(b1!=NULL)
   {
    cout<<b1->info;
      b1=b1->next;
      cout<<"  ";
   }
}

void tambah_awal(int x)
{
   if(awal==NULL)
   {
    data=new simpul;
      data->prev=NULL;
      data->info=x;
      data->next=NULL;
      awal=data;
      akhir=data;
   }
   else
   {
  data=new simpul;
      data->info=x;
      data->prev=NULL;
      data->next=awal;
      awal=data;
   }
}

void tambah_akhir(int x)
{
   if(awal==NULL)
   {
    data=new simpul;
      data->prev=NULL;
      data->info=x;
      data->next=NULL;
      awal=data;
      akhir=data;
   }
   else
   {
  data=new simpul;
      data->info=x;
      data->prev=akhir;
      akhir->next=data;
      data->next=NULL;
      akhir=data;
   }
}

void tambah_tengah(int in,int setelah)
{
    b1=awal;
      b2=b1->next;
    while(b1->info!=setelah)
    {
     b1=b1->next;
       b2=b1->next;
    }
  data=new simpul;
    data->info=in;
      b1->next=data;
      data->prev=b1;
      data->next=b2;
      b2->prev=data;
}
void main()
{
   int pilih,n,nn;
   char lagi;
   do
   {
   clrscr();
   cout<<"================================================\n";
   cout<<"||         PROGRAM SINGLE LINKED LIST         ||\n";
   cout<<"================================================\n";
   muncul();
    cout<<"\n\n1. Tambah Awal";
    cout<<"\n2. Tambah Akhir";
    cout<<"\n3. Tambah Tengah";
    cout<<"\n===============================================";
    cout<<"\nPilihan Anda : ";cin>>pilih;
    cout<<"===============================================\n";
    switch(pilih)
    {
       case 1:
       cout<<"Masukkan Data    : ";cin>>n;
       tambah_awal(n);
         break;
         case 2:
       cout<<"Masukkan Data    : ";cin>>n;
       tambah_akhir(n);
         break;
         case 3:
       cout<<"Masukkan Data    : ";cin>>n;
         cout<<"Dimasukkan Setelah : ";cin>>nn;
       tambah_tengah(n,nn);
         break;
         case 4:


         break;
    }
    cout<<"Lagi (y/t)? ";cin>>lagi;
   }
   while(lagi=='y'||lagi=='Y');
}