how to print the below in c++

Question

          1
         121
        12321
       1234321

Answer 1

My code in c++.. hope it helps..

#include<iostream>
using namespace std;
int main()
{
 int num_of_lines = 10;
 for(int n=1; n<=num_of_lines; n++){
  int i;
  for(i=1;i<=num_of_lines-n;i++)
   cout<<" ";
  for(i=1; i<n; i++){
   cout<<i; 
  }
 for(i=n; i>=1; i--){
  cout<<i; 
 }
 cout<<"\n"; 
 }
 return 0;
}