C++ Program to display pyramid of digits

Statement:
C++ Program to display pyramid of digits
Code : 

//C++ Program to display pyramid of digits. and rows entered by user

#include<iostream>

using namespace std;

int main()

{

       cout << "\t\t\tPyramid Of digits\n\n";

       int num,spc,i, j, k, l;

       k = 0; l = 0;

              cout<<"Enter the number of rows: ";

              cin >> num;

              for (i = 1; i <= num; i++) //loop for control user entered number and newline

              {

                     for (spc = 1; spc <= num - i; spc++) //spc is a variable for spaces and this loop is to control spaces

                     {

                           cout << " ";

                           k++;

                     }

                     for (j=0; j != 2 * i - 1;j++) //this loop will print numbers by condtion

                     {

                           if (k <= num - 1) // this condtion will print numbers brfore maximum interval

                           {

                                  cout<<i + j;

                                  k++;

                           }

                           else //print numbers after maximum number

                           {

                                  l++;

                                  cout<<(i + j - 2 * l);

                           }

                          

                     }

                     l = 0; k = 0; j = 0; //updating vluse of i j and k before next printing

                     cout<<"\n"; //add newline after once line print

              }

       cout << "\n\n";

       system("pause");

       return 0;

}