angka dan segitiga

#include <iostream>

using namespace std;

int main()
{
    int angka,tampil=1,tampil2,tampil3=2,tampil4;
    cout << "Masukkan angka : ";
    cin >> angka;
    tampil2=angka;
    tampil4=angka-1;
    int kiri=angka+1;
    int kanan=angka-1;

    for(int a=1;a<=angka*2-1;a++){
        for(int b=1;b<=angka*2-1;b++){
            if(a==1){
                if(b%2==0){
                    cout << " ";
                }else{
                    cout << tampil;
                    tampil++;
                }
            }else if(a==angka*2-1){
                if(b%2==0){
                    cout << " ";
                }else{
                    cout << tampil2;
                    tampil2--;
                }
            }else if(a>1 && a<angka*2 && b==1){
                if(a%2==0){
                    cout << " ";
                }else{
                    cout << tampil3;
                    tampil3++;
                }
            }else if(a>1 && a<angka*2 && b==angka*2-1){
                if(a%2==0){
                    cout << " ";
                }else{
                    cout << tampil4;
                    tampil4--;
                }
            }else{
                if(a<=angka){
                    if(b>=kiri && b<=kanan){
                        cout << "*";
                    }else{
                        cout << " ";
                    }
                }else{
                    cout << " ";
                }
            }
        }
        kiri--;
        kanan++;
        cout << endl;
    }
}