Program C++ : Menghitung Bilangan Kuadrat Histogram

#include <iostream.h>

int garis ()
{
int a;
for (a=0;a<40;a++)
cout<<"=";
cout<<endl;
}

void main()
{
char l;
int i, bil[3], kd0, kd1, kd2;
nun:
garis () ;
cout<<"\tBILANGAN YANG DI INPUTKAN : ";
for (i= 0; i<3; i++)
{
cout<<"\nBILANGAN KE ["<<i+1<<"]: ";
cin>>bil[i];
}
kd0= bil[0]*bil[0];
kd1= bil[1]*bil[1];
kd2= bil[2]*bil[2];
garis () ;


cout<<"\tBILANGAN KUADRAT HISTOGRAM"<<endl;
cout<<"\nBILANGAN "<<bil[0]<<" = "<<kd0<<"\n";
cout<<"\nBILANGAN "<<bil[1]<<" = "<<kd1<<"\n";
cout<<"\nBILANGAN "<<bil[2]<<" = "<<kd2<<"\n";
garis () ;
cout<<"INGIN HITUNG LAGI ? [Y|T]: ";  cin>>l;
if (l=='y'||l=='Y')
{
goto nun;
}
 }