Triangular Number Pattern in C

#include<stdio.h>
#include<stdlib.h>
int main(){
  int i,j,k,l,n;
system("cls");
printf("enter the range=");
scanf("%d",&n);
for(i=1;i<=n;i++)
{
for(j=1;j<=n-i;j++)
{
printf(" ");
}
for(k=1;k<=i;k++)
{
printf("%d",k);
}
for(l=i-1;l>=1;l--)
{
printf("%d",l);
}
printf("\n");
}
return 0;
}