Program C++ menggunakan FOR membentuk Panah Kosong

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#include <iostream.h>
main ()

{
int a,b,c,x;
cout<<"Masukan Batas : ";
cin>>x;

for (a=1;a<=x;a++)
{
cout<<"*";

for(b=1;b<=a;b++)
{
cout<<" ";
}
cout<<"*";
cout<<endl;
}

for (a=1;a<=x;a++)
{
cout<<"*";
for(b=x;b>=a;b--)
{
cout<<" ";
}
cout<<"*";
cout<<endl;
}
}
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  Semoga Bermanfaat ;)