membuat piramida * pada c++

CODING

#include<iostream.h>

#include<conio.h>

int main()

{

int i,j,x,y,bil;

cout<<"Masukkan jumlah bilangan : "; cin>>bil;

for(i=0;i<=bil;i++)

                {

                for(j=1;j<=bil-i;j++)

                                {

                                cout<<" ";

                                }

                for(x=1;x<=i;x++)

                                {

                                cout<<"*";

                                }

                for(y=2;y<=i;y++)

                                {

                                cout<<"*";

                                }

                                cout<<"\n";

   }

getch();

}