BOX PATTER IN C++

//box pattern

#include<stdio.h>
#include<conio.h>
#include<iostream.h>
int main()
{
    int no,i,j,a,b;
    clrscr();
    cout<<"\n Enter the number: ";
    cin>>no;
    cout<<"\n\n===============CUBE========================="<<endl;
    //full cube
    for(i=0;i<(no*2);i++)       //loop=1
    {
//half part
        for(j=0;j<(no*2);j++)   //loop=2
        {

            if(j<no)
            {
                if(j<=i && i<no)
                {
                    cout<<j+1<<" ";
                }
                else if(j>i && i<no)
                {
                    cout<<i+1<<" ";
                }
            }
            if(j>no)
            {
                b=(no*2)-j;
                if(b<=i && i<no)
                {
                    cout<<b<<" ";
                }
                else if(b>i && i<no)
                {
                    cout<<i+1<<" ";
                }
            }
        }
//second half cube
        a=(no*2)-i;           //for i=1 and then i++;
        for(j=0;j<(no*2);j++)         //loop=3
        {
            if(j<no)
            {
                if(j<a && i>no)
                {
                    cout<<j+1<<" ";
                }
                else if(j>=a &&i>no)
                {
                    cout<<a<<" ";
                }
            }
            if(j>no)
            {
                b=(no*2)-j;
                if(b<=a && a<no)
                {
                    cout<<b<<" ";
                }
                else if(b>a && a<no)
                {
                    cout<<a<<" ";
                }
            }
        }
        if(i!=no) //avoid blank line of middle
        {
            cout<<endl;
        }
    }
    getch();
    return 0;
}