01pattern.cpp

#include<iostream>
using namespace std;

int main()
{
    int i,j,n;
    cout<<"Enter any number: ";
    cin>>n;
    for(i=1;i<=n;i++)
       {
           for(j=1;j<=i;j++)
              {
                  if((i+j)%2==0)
                    {
                        cout<<"1";
                    }
                  else
                  {
                      cout<<"0";
                  }
                    
              }
            cout<<endl;       
       }
    return 0;
}