INTERESTING PROGRAM of c.

‪#‎include<stdio.h>

int main()

{

int i,j,k,n,a,b;

printf("How many lines?");

scanf("%d",&n);

n=n*2;

for(i=1;i<n;i+=2)

{

for(j=n-1;j>i;j-=2)

printf(" ");

for(k=1;k<=(i/2)+1;++k)

printf("%d",k);

for(k=i/2;k>=1;--k)

printf("%d",k);

printf("\n");

}

return 0;

}