C++ programme to print pyramid pattern

//This programme is tested on visual studio 2012//
#include<iostream>
using namespace std;
void main()
{
    int n,t=1;
    cout<<"------------------------------------------------------------------------------\n";
cout<<"This programme will print a pyramid pattern on entering number greater than 1\n";
cout<<"------------------------------------------------------------------------------\n";
    cout<<"Enter number :- ";
    cin>>n;
    while (n<=1)
    {
    cout<<"You entered invalid input Try again :\n";
    cout<<"Enter number";
    cin>>n;
    }
    for(int i=1;i<=n;i++)
    {
        if(i==1)
        {
        for(int j=1;j<=n;j++)
        {
       
        cout<<" ";
    }
        cout<<"*"<<endl;
        }
        else
        {
            for(int z=i;z<=n;z++)
            cout<<" ";
        cout<<"*";
        for(int k=i+1;k<t;k++)
        cout<<" ";
        cout<<"*"<<endl;
    }
        t=t+3;
    }
    cout<<"\n\n------------------------------------------------------------------------------\n";
    cout<<"Thank You for using.\n\nVisit http://bilalzahid22.blogspot.com/ for more\n";
  cout<<"\n------------------------------------------------------------------------------\n";
}