write a c 2b 2b program to print number triangle

1#include <iostream>  
2using namespace std;  
3int main()  
4{  
5int i,j,k,l,n;    
6cout<<"Enter the Range=";    
7cin>>n;    
8for(i=1;i<=n;i++)    
9{    
10for(j=1;j<=n-i;j++)    
11{    
12cout<<" ";    
13}    
14for(k=1;k<=i;k++)    
15{    
16cout<<k;    
17}    
18for(l=i-1;l>=1;l--)    
19{    
20cout<<l;    
21}    
22cout<<"\n";    
23}    
24return 0;  
25}