Generate Pascal's Triangle in C

Write a C program to generate Pascal's triangle

#include<stdio.h>

#include<conio.h>

void main()

{

            int bin,p,q,r,x;

            clrscr();

            bin=1;

            q=0;

            printf("Rows you want to input:");

            scanf("%d",&r);

            printf("\nPascal's Triangle:\n");

            while(q<r)

            {

                        for(p=40-3*q;p>0;--p)

                                    printf(" ");

                        for(x=0;x<=q;++x)

                        {

                                    if((x==0)||(q==0))

                                                bin=1;

                                    else

                                                bin=(bin*(q-x+1))/x;

                                    printf("%6d",bin);

                        }

                        printf("\n");

                        ++q;

            }

            getch();

}