Half diomand shape

Write a program which takes a as input and draw the half diomand shape.

#include
#include
void main(void)
{
   clrscr();
   int a,b,n,i,j,sp1,sp2;
   printf("Enter Odd Number = ");
   scanf("%d",&n);
   for(a=1;a<=n+2;a=a+2)
   {
       for(sp1=a;sp1<=n;sp1=sp1+2)
       printf(" ");
       for(b=1;b<=a;b++)
       {
       printf("%d",b);
       }
       printf("\n");
   }
   for(i=n;i>=1;i=i-2)
   {
       for(sp2=n;sp2>=i;sp2=sp2-2)
       printf(" ");
       for(j=1;j<=i;j++)
       {
       printf("%d",j);
       }
       printf("\n");
   }
   getch();
  }