C Language Progarm for Calculate Pascal Triangle

#include<stdio.h>

#include<conio.h>

void main()

{

 int a[10][10];

 int i,j,c,n,s;

 clrscr();

 printf("\nEnter how many lines do you want");

 scanf("%d",&n);

 a[1][1]=1;

 printf("\n%5d",a[1][1]);

 a[2][1]=1;a[2][2]=2;a[2][3]=1;

 printf("\n%3d %d %d",a[2][1],a[2][2],a[2][3]);

 for(i=3;i<=n;i++)

  {

   a[i][1]=1;

   printf("\n%d ",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("\n%d",a[i][j]);

 }

}

Sample Output :
Enter how many lines do you want6
            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

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