Write a program in C++ to find Pronic Number between 1 to 1000

#include<bits/stdc++.h>
using namespace std;

int main()
{
    int prno,i,n,flg;
 cout << "\n\n Find the Pronic Numbers between 1 to 1000: \n";
 cout << " -----------------------------------------------\n";
 cout << " The Pronic numbers are: "<<endl;
 for(prno=1;prno<=1000;prno++)
 {
     flg=0;
    for(i=1;i<=prno;i++)
        {
            if(i*(i+1)==prno) 
            {
            flg=1;
            break;
            }
        }
            if(flg==1)
            {
            cout << prno<<" ";
            }
 }
            cout << endl;
}