Program to print the first 10 lines of pascal's triangle

#include <iostream.h>
#include <conio.h>
#include <iomanip.h>
long triangle(int x,int y);
int main()
{
clrscr();
const lines=10;
for (int i=0;i<lines;i++)
for (int j=1;j<lines-i;j++)
cout << setw(2) << " ";
for (int j=0;j<=i;j++)
cout << setw(4) << triangle(i,j);
cout << endl;
getch();
}
long triangle(int x,int y)
{
if(x<0||y<0||y>x)
return 0;
long c=1;
for (int i=1;i<=y;i++,x--)
c=c*x/i;
return c;
}

This program does not take in any screen inputs from the user.
It just prints out the first ten lines of the pascal's triangle using the 'cout' command.

-----SAMPLE INPUT
No input from the user for this program.

----SAMPLE OUTPUT
1 10 45 120 210 252 210 120 45 10 1