#include<stdio.h>
#include<conio.h>
void main()
{
 int a[10][10];
 int i,j,c,n;
 clrscr();
 printf("enter how many line do you want: ");
 scanf("%d",&n);
 a[1] [1]=1;
 printf("%39d ",a[1][1]);
 a[2][1]=1;a[2][2]=2;a[2][3]=1;
 printf("\n%37d %d %d ",a[2][1],a[2][2],a[2][3]);
 for(i=3;i<=n;i++)
 {
  a[i][1]=1;
  printf("\n%36d ",a[i][1]);
  j=2;c=3;
  while(j<=i)
  {
   a[i][j]=a[i-1][c-1]+a[i-1][c-2];
   printf("%d ",a[i][j]);
   c=c+1;
   j=j+1;
  }
  a[i][j]=1;
  printf("%d",a[i][j]);
 }
 getch();
}
 
*******************output*********************
enter how many lines you want: 7
                                1
                              1 2 1
                             1 3 3 1
                             1 4 6 4 1
                             1 5 10 10 5 1
                             1 6 15 20 15 6 1
                             1 7 21 35 35 21 7 1
 
i have problems in making the shape a triangle..